Hobie:
Appears to be a very nice gun. Perhaps a re-brown for the barrels but without seeing the whole gun, I can't say. Outstanding condition as-is however.

Unless there's been some honing, the barrels are indicated 12/13 for bore. "Choke" and "not for ball" obviously discloses original choke of some degree. Perhaps its still there. Measurement will tell.

The polished barrel flats are interesting. Not too common, but possible.

In any case, a fine gun and well worth respect.