Omega Seamaster Bumper 2577-22 SC Cal 354

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Hi guys, I am trying to identify my first Omega Seamaster Automatic vintage "bumper". I can't seem to find the exact model online to verify it's authenticity. It's working well, very accurate but it needs some servicing.

2577-22 SC
Cal 354
Reference: 136883212
Crossline with Waffle Dial
Beads of Rice Bracelet

Thanks for all your help.

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