Post by Benchdweller on Jan 2, 2020 18:34:30 GMT -8
I'm not sure if you've decided to tackle this yet Don but the case number will be between the lugs and tell you what's inside.
My money's on a 3135 and you'll need the correct case back tool, the Microstella tool for regulating, a specific punch and staking set if the rotor axle needs replacing and the teflon reverser wheels should be coated with Epilame. Other than that it's just another automatic three hand movement, just slightly different in much the same way a 5126 differs from a 6309 and it's of much higher quality, which I'd say makes it easier to work on than a 5126 although regulating can daunting with the hairspring in such close proximity.
One thing to be aware of is the price of the parts and how much it's going to cost you if something pings across the room or gets damaged when you're working on it. There's a little jewel on the date jumper which is very easy to lose and will cost around £40 to replace and a new balance wheel is around £400 which certainly focuses the mind when you're regulating it.