They aren't worth anything, that much I know... It be nice to get it working but not if parts are gonna be scarce and it'll cost a fortune to fix...
Piece of string one mate, depends on what's wrong with it. But parts aren't scarce. If I were you I'd send it off to Richard Askham and ask him to give you a quote / appraisal.
But 'a fortune to fix' for a Bell-Matic? No.
http://thewatchspotblog.com/?tag=seiko-bell-matic
@VanUden started
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They aren't worth anything, that much I know... It be nice to get it working but not if parts are gonna be scarce and it'll cost a fortune to fix...