

Yuck the case back gasket has melted.. Well that confirms the story that it has not been used in a long time, but the movement looks excellent.

Here you can get a better view of the hairspring. It must have received a proper shock at one point.

Best way to tackle the issue was unscrewing the boot from the balance cock and then carefully lifting the balance cock out, freeing the coil from the regulator pin. It worked and the hairspring is completely undamaged.

I have put the gear train, setting lever/winding mechanism back in place. However I can’t wind the movement before fitting the hour recorder bridge as it also holds the lower barrel arbor pivot.

It’s not always straight forward.. After fitting the dial and hands I noticed I had one large screw remaining in my parts tub. That was the screw that prevents the setting lever from unscrewing too far when removing the setting lever. Second time I fitted the dial and hands the hour recorder was creeping.
2 Responses to Service Omega Seamster De Ville calibre 321
Lovely Seamaster- it reminds me a bit of the Movado Sub Sea chronograph (which is also lovely). The whole thing is in fantastic condition too. Makes one quite envious. ;o)
Nice job sorting out that hairspring without any damage. I image a replacement would be impossible to source.
Yes it’s a great watch! And I’m happy it has not been slaughtered for a common speedy! I would not want to fork out for a new hairspring considering what they go for:D