Seller seems legit, and looks good to me. He states it is a 1035 (probably means 1039 if it is 20mm), but obvious issue is it is not stamped as such. Opinions from the experts?
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I think you'll find that it is neither, looks like it could be a 1175 - but again not marked so not too sure!

 

Looks to me like an 1175 with a replacement inner clasp.

 

It’s an 1175 with an inner clasp from a J/M “Holzer” bracelet.

 

I have seen several similar bracelets. Do you think they came from Omega this way, or are they "put-togethers"?