Champagnesky Posted February 9, 2017 Report Share Posted February 9, 2017 What vintage crown is this? Hi everyone! Ive tried to fit an old crown that I got from a friend on my newly acquired mbw 1680. Unfortunately it didnt fit on the mbw tube. It didnt fit on other tubes i had from cartel either. What crown is this and what tube should i get? Link to comment Share on other sites More sharing options...
Nanuq Posted February 10, 2017 Report Share Posted February 10, 2017 It looks like the brass threads extend to the base on the inside. Is that so, or is there a smooth area below the threads, that would seal against an o-ring? That tells you if it's a 702 vs a 703. You'll need the corresponding tube. Also looks like you'll have trouble getting it to screw onto a stem. 1 Link to comment Share on other sites More sharing options...
hugop Posted February 10, 2017 Report Share Posted February 10, 2017 Maybe a 703? I have installed several vintage 703 crowns on my MBWs, JKFs and Vietnam cases and have had to put 7030 tubes in for them. The 702 crowns require a 7020 where the threads are closer to the case and the tube has a taller [censored] above the threads. So threads up in the crown 703. Threads close to the edge of the crown 702. Both tubes are available from clark for a inexpensive price on the bay.Sent from my SM-G920P using Tapatalk 1 Link to comment Share on other sites More sharing options...
Champagnesky Posted February 10, 2017 Author Report Share Posted February 10, 2017 Threads are long inside, tried with these tubes but IT didnt workSkickat från min iPhone med Tapatalk Link to comment Share on other sites More sharing options...
Champagnesky Posted February 10, 2017 Author Report Share Posted February 10, 2017 10 hours ago, Nanuq said: It looks like the brass threads extend to the base on the inside. Is that so, or is there a smooth area below the threads, that would seal against an o-ring? That tells you if it's a 702 vs a 703. You'll need the corresponding tube. Also looks like you'll have trouble getting it to screw onto a stem. 10 hours ago, hugop said: Maybe a 703? I have installed several vintage 703 crowns on my MBWs, JKFs and Vietnam cases and have had to put 7030 tubes in for them. The 702 crowns require a 7020 where the threads are closer to the case and the tube has a taller [censored] above the threads. So threads up in the crown 703. Threads close to the edge of the crown 702. Both tubes are available from clark for a inexpensive price on the bay. Sent from my SM-G920P using Tapatalk thx mates, i assume its a 703 crown. I think the it has a lot of dirt inside so i will give it a go in a ultrasonic cleaner. I have a teflon grease i can also use. Link to comment Share on other sites More sharing options...
dbane883 Posted February 10, 2017 Report Share Posted February 10, 2017 99% sure you have a 702 crown there. Link to comment Share on other sites More sharing options...
hugop Posted February 10, 2017 Report Share Posted February 10, 2017 Not sure what was censored above. I thought I had typed [censored] but maybe something autocorrected to something else. In any case my apologies if I posted something inappropriate. Sent from my SM-G920P using Tapatalk Weird, it did it again. Why is a word that starts with fl and ends with ange censored? Anyway, here is a pic of a 702 tube for the op. A pic is worth a 1000 censored words. Haha 99% sure you have a 702 crown there.I defer to the expert on gen rolex bits dbane would certainly know. Link to comment Share on other sites More sharing options...
Nanuq Posted February 10, 2017 Report Share Posted February 10, 2017 Here are some photos that show the difference. The big difference between a 702 and 703 is the added o-ring around the outside base of the 703 tube. So the inside of the 703 crown has to be smooth there to seal against the o-ring. The 702 has no o-ring in that position so the inside of the 702 crown is threaded to the base. Here's a cutaway view of a 702, you can see the threads at the base of the tube, and matching threads inside the crown. Here's a 702 set, with the threads visible Here's a comparison photo side by side, 702 and 703 Here's the smooth inner walls of the 703 where it seals on the o-ring 1 Link to comment Share on other sites More sharing options...
hugop Posted February 10, 2017 Report Share Posted February 10, 2017 Here are some photos that show the difference. The big difference between a 702 and 703 is the added o-ring around the outside base of the 703 tube. So the inside of the 703 crown has to be smooth there to seal against the o-ring. The 702 has no o-ring in that position so the inside of the 702 crown is threaded to the base. Here's a cutaway view of a 702, you can see the threads at the base of the tube, and matching threads inside the crown. Here's a 702 set, with the threads visible Here's a comparison photo side by side, 702 and 703 Here's the smooth inner walls of the 703 where it seals on the o-ring Perfect Nanuq!Sent from my SM-G920P using Tapatalk Link to comment Share on other sites More sharing options...
Champagnesky Posted February 11, 2017 Author Report Share Posted February 11, 2017 Here are some photos that show the difference. The big difference between a 702 and 703 is the added o-ring around the outside base of the 703 tube. So the inside of the 703 crown has to be smooth there to seal against the o-ring. The 702 has no o-ring in that position so the inside of the 702 crown is threaded to the base. Here's a cutaway view of a 702, you can see the threads at the base of the tube, and matching threads inside the crown. Here's a 702 set, with the threads visible Here's a comparison photo side by side, 702 and 703 Here's the smooth inner walls of the 703 where it seals on the o-ring Thx Nanuq its a 703 i have then. IT fitted on a tc tube I had, but it has a lot of dirt inside so I will need to clean it. Will add some teflon grease inside too.Skickat från min iPhone med Tapatalk Link to comment Share on other sites More sharing options...
ronin007 Posted February 12, 2017 Report Share Posted February 12, 2017 any ideas on these please, got them all mixed up Link to comment Share on other sites More sharing options...
Champagnesky Posted February 13, 2017 Author Report Share Posted February 13, 2017 12 hours ago, ronin007 said: any ideas on these please, got them all mixed up How do they look like underneath? Link to comment Share on other sites More sharing options...
ronin007 Posted February 13, 2017 Report Share Posted February 13, 2017 Link to comment Share on other sites More sharing options...
hugop Posted February 13, 2017 Report Share Posted February 13, 2017 My guess is left to right 703 704 704 Sent from my SM-G920P using Tapatalk The 703 is clad and has a broken stem in it. The 704's are monoblock. Sent from my SM-G920P using Tapatalk Link to comment Share on other sites More sharing options...
ronin007 Posted February 13, 2017 Report Share Posted February 13, 2017 I haven't really a clue, will have to go over some old emails as I had a few fitted and everything got mixed uo,as you look at them head on the one with the tube which is the left one in last photo is exactly the same as a 703 vintage I just got from sub007, Link to comment Share on other sites More sharing options...
hugop Posted February 13, 2017 Report Share Posted February 13, 2017 Yes it looks like a 703. The one on the middle looks rep to me. The side profile and thickness on the right looks more gen or possibly TC. Sent from my SM-G920P using Tapatalk Here is a gen 704 to compare... 1 Link to comment Share on other sites More sharing options...
ronin007 Posted February 13, 2017 Report Share Posted February 13, 2017 That would make sense as I have a tc and had the crown replaced to a gen 704,amazing,always great to have your expert views Link to comment Share on other sites More sharing options...
Sub007 Posted February 13, 2017 Report Share Posted February 13, 2017 Yes it looks like a 703. The one on the middle looks rep to me. The side profile and thickness on the right looks more gen or possibly TC. Sent from my SM-G920P using Tapatalk Here is a gen 704 to compare... +1 left 703 and right 704 are Gen. middle one is a repVerzonden vanaf mijn iPhone met Tapatalk Link to comment Share on other sites More sharing options...
ronin007 Posted February 13, 2017 Report Share Posted February 13, 2017 Checked my emails and used the 2 704s so the 703 is gen , trying to figure what the others came off, think the Rep was knackered , I'll get another picture to show Link to comment Share on other sites More sharing options...
Nanuq Posted February 13, 2017 Report Share Posted February 13, 2017 Ronin, see the gen 703 on the left? Look closely and you can see thin stainless steel wrapped over a brass core. It's visible on the edge that would be closest to the case, where the tiny folds overlap. Only gen crowns are made like this, 700 - 702 - 703. The 704 is "monobloc" so it's carved from one piece of steel, hence no need for steel wrap over a brass core. It also has much thinner walls than a 703. MBW "703" crowns have nice thick walls, just like the middle one in your photo. Hint: They're great raw material for using a dremel and file to put a bevel on the case side and mimic a 702. So IMO you have, left to right, gen 703, MBW 703 and gen 704. 1 Link to comment Share on other sites More sharing options...
jigelow Posted February 14, 2017 Report Share Posted February 14, 2017 Yeah. The middle one in the first photo is a rep. My hunch was the not quite right dots on it. Link to comment Share on other sites More sharing options...
ronin007 Posted February 14, 2017 Report Share Posted February 14, 2017 This is a mbw case, the owner before wasn't sure ? Link to comment Share on other sites More sharing options...
ronin007 Posted February 14, 2017 Report Share Posted February 14, 2017 Then this ones I said everything got mixed up a bit, think it was all the drugs when I broke my femur last year Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now