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nickelsilver last won the day on February 18

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  1. Have these two on the bench this week, thought it was a funny contrast. The left is the Lemania 5100, perhaps the epitome of industrialization and use of injection molded plastic in a mechanical chronograph; almost the whole chrono mechanism is on the dial side, under an acrylic plate that supports the date rings. Vertical clutch with nylon gearing in it, plastic all over. Extremely reliable however! This one had suffered some sort of chemical exposure in the past, with pock marks in the rhodium plating and harsh staining on the barrel great wheel. Ended up running fine with 11 second delta in 6 positions. The right hand one is a Longines 30CH, one of the most beautiful chronos ever made in my opinion. This one was in fine shape other than a non-original, ugly, and nonfunctional minute counter jumper. The one present in the photo is the replacement I made. This beauty had a whopping 16 second delta, and still hit near 270 degrees amp at 24 hours. Amazing.
  2. The Tudor with the ETA base would use ETA or "normal"; Rolex reversers are fairly unique in design.
  3. Do you have endshake? It is unlikely (essentially impossible) for the holes to become tight over time, but it is possible for the cap to sit too low in the center, zapping the endshake and causing drag. If you're motivated to do it, it would be interesting to see what your amplitude is as is, then after correcting the barrel.
  4. As far as I know only Rolex specifies using Fixodrop (epilame) on their reversers, this is because they very much need oil at specific locations and absolutely cannot have oil at others, or they won't work. The epilame keeps the oil from creeping to the wrong place. Typical reversers are oiled in a bath of solvent with a little oil added (old school technique, example would be a couple of drops of 9020 in 10ml of benzine), or with Moebius Lubeta v105 (current practice).
  5. Absolutely, the hairspring is the most delicate thing in the watch- when it comes to manipulation. It's unlikely that the hairspring was like that before you removed the balance cock. It simply wouldn't have run. It can't get like that from a drop or even being thrown from a rooftop. As I understand it, the Chinese movements often leave the factory unlubricated and even with manufacturing debris present. This was probably the cause of stopping.
  6. The hairspring is destroyed. That it even ticks is surprising!
  7. Normally this check is done clean and dry, but clean and oiled is OK too. Ideally it should move with a blower but just moving it by hand will tell you if it's free. You need some endshake, not excessive, and as said above it shouldn't have too much "tilt", this is a sign that the holes need to be closed. If holding with a pinvice you have to watch that the pinvice isn't influencing things. I prefer to capture the ends of the arbor in the flats of stout tweezers.
  8. That is a chronometer certified movement if I'm not mistaken, and should be an absolute piece of cake to regulate to that level. It should also maintain that rate or darn close to it after 24 hours, which would be a hair over 50% of the reserve total. If it was serviced recently the watchmaker should definitely have a look.
  9. How big was the original rubbed in jewel? The material there is minimal, generally you'd ream well oversize to get outside the "rub in" area so there's some substance for the friction fit, unless you have a jewel that's just a hair over original. The reamers can go oversized, we're talking 0.01mm friction fit, best to have plug gages to check (I know nobody has them) or go almost all the way and test.
  10. Praezis actually makes these for a very reasonable price- I'm glad you posted, I've been meaning to buy one and it slipped through the cracks, will order now! If you send him a message he can send the info and user manual, it looks like a killer tool. Not only are the master balances rare to find (in odd beats especially), they are prone to damage and drifting in precision. I only do a hairspring every few months but I know this will pay for itself in zero time (pun intended).
  11. Here's a screen shot of recent sold Ascot listings on Ebay. You can see your exact chrono paired with another watch for 15 pounds. So I will eat my hat, they are valuable.
  12. Does the Zenith have square jars? They don't necessarily need it.
  13. Pretty much every cleaning machine that spins has some sort baffle in the jar, sometimes in the bottom sometimes up the side, keeps the fluids from sloshing around too much.
  14. They are generic quartz watches, essentially worthless. Sorry to put it bluntly.
  15. The C clip looking thing just prys off.
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