My Watchmaker uses only one oil !!!
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From what I see, the crystal is made of mineral glass and is secured to the bezel with a sealing ring. If you might want to replace the crystal without removing the bezel or the movement, I think it's possible, but risky. You have to suck out the old crystal without breaking it into tiny particles.
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It works quite well. The only strange thing is that it loses 2/3 mn per day whereas the measurements indicate that it is fast by 1/2 mn. Maybe something wrong with the gear mechanism ...
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Unfortunateā¦but you clearly have a Longines branded movement with a year 1936 serial consistent with the caliber. I checked the case maker of the last few Longines I worked on⦠ā¦same as your watch, so certainly you have grounds to honestly describe your watch as a Longines cal 25.17 tank with unbranded dialā¦and given the modesty of the watch IMO the Longines authentication wouldnāt dramatically alter the value, if thatās what you are hopingā¦as nucejoe suggests the value will mostly be determined by how well it runsā¦
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It's difficult to tell, but my guess is it just looks like it has a bezel. Once you have removed the movement, you should be able to tell. Either way, I think you should be able to press out the old crystal from the inside as long as you have a die that properly supports the area around the crystal. So, take it a part first and then assess if any additional tools or actions are needed. Let us know how you do! Ā
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That was observant! I completely missed that, and it explains everything. Thank you! That's great! Admittedly, there's a big difference between 4 years and, in my case, 7.5 years to be more precise ā but still. Also, I was early in using my stereo microscope during oiling and extremely careful not to over-oil. I actually think ā even if it sounds unlikely ā that I tend to under-oil.
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