Did you find the loose retaining screw and keeper? Or where they nonexistent? At this point I'd say release the winding stem, take loose the single retaining screw & keeper, and uncase to look close and make sure that there really isn't a loose screw and keeper in the movement.
Well, the bridges and the Cortebert engraved wheel.
Also same amount of identicalness as the Molniya 6201, made on the same machines sold by Cortebert to the Russians.
Yes, it does. But Sebvad seems tinker-averse, and has an expressed narrowness of interest falling outside of being a watch mechanic. Besides, it probably needs a service anyway to make sure it lasts.
Well if you work for the big one you could head to Philly Chinatown around JFK Plaza and look there, maybe take a rest stop in Lititz on the way... But don't feed the starving watchmaking students.
On the other end of the state, I guess you could take a trip to Pittsburgh and have lunch at the Chinatown Inn on 3d off Grant and ask about watchmakers there.