Not my first rodeo with this Hamilton caliber.
I bought it in non-running condition, but no explanation as to why.
The watch was not abused..perfect dial, case, original box.
Really nice example.
I saw ( and replaced ) a bent staff.
Also replaced the roller with another one I had, as it had a chipped impulse pin
No other chips or damage to any other jewels. Inspected with a 20 power loupe
Cleaned the movement in fresh Zenith solutions.
Hairspring cleaned in One-Dip
Oiled with brand new Moebius oils
9010 for the balance and escape wheel
941 on the pallet stones
9104 / HP1300 on the 2nd, third and fourth wheel
8200 on the new mainspring and barrel
Without the balance installed. the train worked perfectly, including the small rebound at the end.
So, I add the balance.
Pallet fork lines up dead center between the banking pins
Hairspring has no kinks, moves freely. Doesn't have a "riding" condition on the arms, no mis-shaped coils or magnetism. Coils look really concentric and aren't sticking.
Fires up after about the 10th wind, then picks up amplitude.
Stick it on the timing machine and it all goes to "south".
In dial down:
No rate registers..but the tracks show it's gaining a bit
Amplitude is around 250.
Beat error shows 5.1 MS ..( yet the fork rested perfectly centered at rest ) ?
Rate keeps showing 19800..not the 18000 it should be.. ???
Pendant down
Pretty much the same readings ..but a bit lower amplitude.
I know the machine is running well, as I put my personal 921 on it and it reads as it should;
Amplitude around 285
Beat error around 0.8
Rate at 18000
I've watched it with a 10P loupe while running. Can't see anything that looks off.
HELP !! LOL !!!!
Randy