rionrlty Posted February 28, 2015 Report Share Posted February 28, 2015 He guys, I need some advice on a problem I'm having. About 6 months ago I bought a new Navitimer 01 from puretime. The purchase was a pleasant experience and I love the watch. It was advertised as having an A7750, which for some reason needed to be a slow beat version at 21,600 bph, instead of the normal 28,800 bph. This didn't concern me at the time as I have had many watches with slower beats that performed great. The watch performs great most of the time, keeping accurate time with good reserve, sometimes for as long as 2 or 3 days at a stretch. But then without warning and over a very brief period, sometimes less than an hour, it will gain up to 6 or 7 minutes. Once reset it may keep accurate time for only a few hours or as much as 2 days or more. This happens whether I wear it or put it on a winder. My watch repair guy cannot determine why, but he has captured the anomaly on a timegrapher First of all does anyone know exactly why this watch had to be produced with the slow beat movement? Secondly, has anyone else had this problem or know what is causing it? Can a slow beat movement be upgraded to fast beat by changing the balance and escapement? Quote Link to comment Share on other sites More sharing options...
POTR Posted February 28, 2015 Report Share Posted February 28, 2015 Something is effectively shortening the balance spring randomly. What would be causing this? The balance spring is sticking to itself because it is gummy from migrated lube. What do you think needs changing now? Quote Link to comment Share on other sites More sharing options...
Rolexman Posted February 28, 2015 Report Share Posted February 28, 2015 You can't upgrade 21.600 to 28.800 by replacing the escape wheel and/or balance. If you want to upgrade you have to drop in an entire new movement and modify the hands. Quote Link to comment Share on other sites More sharing options...
rionrlty Posted March 1, 2015 Author Report Share Posted March 1, 2015 Thanks guys, it sounds like the balance and spring need to be replaced or cleaned. I have a spare A7750 movement that I kept for parts, but it has the old subdial spacing. It is also a high beat so I wonder if the balance and spring will work in this movement. Thanks for the response guys I value your advice. I've written to Angus at Puretime where I bought the watch, but it is Chinese New Year there, so I won't hear back for while yet. I really want to get this one working right. Which parts are actually different between the 28,000bph and 21,600bph movements? I'm just curious. Has anyone determined exactly why they used this movement or if they changed to a high beat movement later in production? It would be worth it if I could source a new movement. Rolexman, you don't have a spare ETA 7753 laying around do you? Quote Link to comment Share on other sites More sharing options...
POTR Posted March 2, 2015 Report Share Posted March 2, 2015 In addition to the balance and escapement, all of the wheels have different teeth. Quote Link to comment Share on other sites More sharing options...
importr Posted March 2, 2015 Report Share Posted March 2, 2015 To partly answer your question, my navi01 is a high beat movt. Quote Link to comment Share on other sites More sharing options...
rionrlty Posted March 3, 2015 Author Report Share Posted March 3, 2015 Yeah, I had heard they eventually put in the fast beat movement. I was so impatient that I ordered the slow beat version when they first came out. I don't know how many factories made this, but I have personally seen two different case shapes on the Navitimer 01 (the one with the gold wings at 12). The one I got is very accurate to the gen, but on the other one I saw the lugs were wrong. The bevel on the outside of the lugs was not pronounce enough. This was also a mistake on the old Navitimer rep (date at 3)., but they've just come out with new one (date at 4:30) which seems very accurate in case shape. I wonder why this is so hard to get right. Quote Link to comment Share on other sites More sharing options...
importr Posted March 3, 2015 Report Share Posted March 3, 2015 This is mine with the rhodium under black dial which earlier Reps didn't have. I don't think the latest cartel navis with modded dw have the rhodium plating. Quote Link to comment Share on other sites More sharing options...
lawrence3434 Posted March 10, 2015 Report Share Posted March 10, 2015 Beautiful watch whith mode DW but strap is to small. Quote Link to comment Share on other sites More sharing options...
gmg_3 Posted March 13, 2015 Report Share Posted March 13, 2015 Here is my Rep.. Im having a gen two tone gold dial installed and a gen movement. eye candy.. I have a 806 stainless but this stands out. original strap and buckle Quote Link to comment Share on other sites More sharing options...
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