RWG Technical

Excellent video...thanks for the link. RG

It sounds like you have a slipping cannon pinion gear. One way of knowing if the gear is bad, is to turn the crown in the time setting position, if it feels loose and there is not a lot of friction or resistance, this could be the problem... RG

I have only seen one of these, it's here now...broken to heck...and after 1 hour of trying to get it to work, I gave up. The date change gear is used for the GMT wheel, but the GMT wheel is so large in diameter, that the change gear lever is jamming on it, the lever actually extends into the GMT gear teeth... When the watch arrived, the date change gear was broken in two, and the bottom gear was totally off and jammed up under the mainspring barrel... If that wasn't enough, the sliding gear on the keyless works was also broken in two, but even after replacing both of these gears, and trying everything under the sun, I still can't get it to work...so it's not going to be fixed. It's no where near the same design as an ETA 7754, so forget spare parts, no idea if this is the norm for this model, or I just got a lemon, but I am not impressed at all... FWIW RG

Look for a small arrow somewhere on the movement, it should point to a pin or hole, which is the release... RG

Ok, if I can help let me know on PM. RG

THANK You so much for the hallmark information, very informative... I will look into it more. RG

I am sure it can be fixed, it could be something simple or something broken...only way to know is to have a look at it in person... RG

I would check the hole in the dial for the hands, and see if it's touching the hands, that is the most obvious problem, but it's very difficult to know without having the watch in person to examine. If it's stopping when the crown is screwed in place, then someting is moving and jamming up the movement, you have to examine it with a loupe and find where it's moving and what is touching. RG

Sounds like something is definetly wrong with it. Probably not a movement problem, but I would guess that when you screw the crown down, the pressure is causing the dial or movement to shift sideways and this is pressing on the hands, which is causing the watch to slow down... I think the movement is not secure in the case, I would check this before I cut the stem down... RG

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If it keeps on running, then your fine... Try it dial up and dial down, that will at least tell you if you broke one of the pivots on the balance staff... RG

Work is interferring with my hobbies, a "Love In", or 3-day workshop in professional terms...3 days of B O O R I N G meetings...yeach... RG

Other commitments this week will limit my participation here, so plse bear with me on the PM responses and forum posts. I'll be back full time on-line by Friday 16 Feb. This only affects my forum participation, nothing else. Thanks. RG

If your thinking of doing your own work, then investing in a case back tool, is a good start. A LG case opener with the rolex dies is only $60 or so, and well worth it...unless your completely inept, you won't ruin the case by opening it... If the movement is working good, leave it alone, take the Time Zone watch making home study course, and when your done, you can service it yourself... RG

Most of the movemets from Ofrei are used surplus ones...only sealed blister pack ones are direct from ETA and basically serviced. No idea on cousins, but typically most supply houses have two types of ETA's, surplus ones ($100) and ETA factory ones at about twice the price... RG

The easiest, simplest, and best way to tell if it's Asian or Swiss, is to simply look at the balance attachment parts, the Swiss use removable studs, whereas the Asian ones are fixed and screwed in place... It's a old version Asian 7750... RG

Don't know on that one...only you can decide... I have lots of 7750 parts on hand and can most likely retrofit yours to have a day and date...your call if all else fails... RG

Wonderful write up...great job. Nice pics as well. RG

REF: the watch paper, it's only a lint free paper, tracing paper is good, kleenex not so good... RG

I was as surprised as you are, I thought it was a re-badging of an plain jane ETA, but it looks like a full disassembly, and fine polishing and upgraded parts...I like it. RG

Got two ETA 2836-2's in house for work, both have problems... First one, not working at all, no idea why...so I wind it up, fully wound, wont' run, hmmm, that's strange, so I unwind it, remove the balance and pallet arm, try winding it, nothing, seized up solid. So I try moving the wheels and they sort of move, but something is stopping them. I can't see anything, so I move to the dial side before I take anymore apart, what is that I see on the minute transfer wheel...is it oil??? I take the dial side apart, and I find so much oil, that the gears are actually stuck together from the capillary action of the oil and there is so much oil, that the movement can't run...amazing, I have never see this problem before... Can you see the oil on the gears...it's soaking in it... Second one, in for a winding problem, well it doesnt' take long to figure this one out...woops, what happened to the teeth... You just never know what your going to find. RG

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Read this first... How to uncase... NO Super glue, bad idea...epoxy is much better... RG EDIT, Stem in the WINDING position...

The movement requires disassembly to install the parts, and the movement has to be the type that can accept a day wheel... there is a spring needed, a jumper and cooresponding pivot, the day driving wheel etc... Removing the calendar platform bridge, and re-installing it, is one of the most difficult parts to assemble on a 7750, unless you have done it before, it's a excercise in frustration... RG

I don't know yet, but it's on it's way to me...as soon as I get it - out comes the hammer for detailed analysis...(watchmaker hammer) RG