Omega Speedmaster Bracelet

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I found a new Speedmaster bracelet, marked; Nr.12 and end links 311, does anybody know to which Speedmaster it belongs and also his age? Thanks for your help!
 
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A quick search on the 311 end links suggests it’s for a Speedmaster Mk4.5. It may fit other ‘Mark’ series Speedies but it won’t fit the Moonwatch or FOIS.
 
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That chart is a great reference but it won’t help with the OP bracelet.
 
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From the size and shape of the links, could it be a No. 12 marked 1125? Some of them have a year code printed on the clasp.

kind regards Max
 
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There is no year code in it, but someone put the number 150805 in it.