14 Gauge SN 147 -- New user trying to identify Parker SxS

[Logan Strother]

Hello,
I recently came across a lifter-action Parker SxS that I'm having trouble identifying. I tried to find the serial number etc. using the "Technical Information" page here at parkerguns.org, but the numbers don't appear as the website suggests they should. There is no stamp on the number stamped on the lug is 147, which does not match any of the codes provided, and does not make sense as a frame size indicator. There is no stamp on the flat. 147 is also stamped on the watertable - and that is all (no grade, etc.). On the rib "Parker Bros Makers Meriden Conn Damascus Steel" is stamped. Also, the underside of each barrel is stamped with a "22" and what looks like small crown and "BP". I've attached pictures all the stamps and the areas where I would expect stamps where there aren't any.
I'm not sure what gauge the gun is chambered for either: a 12 gauge shell doesn't fit, and a 16 gauge flops around in the chamber. I'm not sure if its a 14 gauge, or if its 16 that's very shot out. The gun is in pretty good shape (far from perfect, to be sure) and has lots of engraving.
Can anyone help me identify this gun?

Thanks -

Logan Strother