1969 6251H is it real?

[Gina Marie]

I bought this bracelet off eBay from a seller in S. Korea. I got it for my 70 1675. I always liked the look of the jubilee on a GMT so I thought, why not. When I got the bracelet I noticed that it was not stamped with the model number. I inquired and the seller told me that the early models were not stamped 6251h....OK, I can see that. I checked the inet and that seemed to be plausible. The next thing I noticed was that the date was engraved and not stamped into the clasp.....is this correct? I thought Rolex date stamped during that period? Am I losing my mind? The item number on eBay is 251890840360

Thanks for you help!