[George "Scott" Davis]

One of my favorite shotguns are Browning Superposed which I shoot weekly via sporting clays or wobble trap. But I need help identifying one which was brought to the club this week:
Grade I
Browning Superposed
Serial Number 9779XX

I've never seen any number like this before on a Superposed and can't identify the year of production. By all other markings it's a Superposed.

Thanks for any assistance you can provide.