1960 Seamaster I.D. and BOR head link question

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Hi gang!

Been meaning to post some updates in the watch treasure hunting thread but wanted to first ask about this oldie but goodie Seamaster. Got it from a local family up here in snooty Connecticut and she's lookin AOK except the BOR head links appear too narrow for the lugs. I called it a 1960 model only because of the inscription date on the case back. It has one of those snap backs that I hate to pry open so I don't know the model number but hopefully some of you experts could clue me in as to what it is, along with suggestions on what # BOR head link would fit that case better? My guess is #11 but wanted to run it by y'all before I start hunting down a pair of them.

Thanks for any replies and info 馃憤

 
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pictures are kind of blurry but I think the dial is fine, original
 
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Hey Fred- nice watch. Endlinks should be stamped 11 or 12 which are 18mm (511 or 512 for later endlinks but they are the same). Those are unmarked and probably 17.5, so either aftermarket or US made for Omega like the JBC鈥檚 were. What clasp stamping does it have?