Unusual clasp on a 6635 rivet bracelet, is it original?

[EH86055]

Hi all,

This 6635 bracelet came on a 1962 Tudor 7965. I noticed the coronet is stamped in the body of the clasp, not integrated into the opening tab as on other examples of this bracelet.

The clasp measures 13 by 23 mm and has six micro-adjust holes. Blade is stamped "Patented & Registered / Swiss Made." Last photo shows a usual 6635 clasp. Searching online, I found smaller clasps for 17 mm bracelets with this logo placement, but none for a 19 mm.

What are your thoughts, folks? Not original? Fake, even?

Thanks all.