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Thanks guys, yes its a 256. Serial Nr 25, bought 20 years ago. I am not that young anymore I guess.
Had seen a Heuer Bundeswehr which it is based on and the smaller size is just nicer on my wrist. Haven't worn watches in 10 years, the Sinn goes to Frankfurt soon for a full service and to see if they have a spare bezel for the future.Also need to decide where to bring those two for a service:
13 hours later: