It seems like I've seen that "swoop" on the back of the action somewhere around here lately, but I can't remember the name of the maker. It was a pretty recent thread though.

I have a light Manufrance Ideal 16ga with those 24" barrels; they're hard to shoot. Mine is very tightly choked but usable with Polywad vintager type spreader loads. This one sounds like someone has already opened the chokes. Nice looking birdgun...Geo