That's an old lake (bird) hunting shotgun. They use to put those on the end of a small row boat and try to get as many birds as they could with one shot.
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
Shotgun Forums
A forum community dedicated to all shotgun owners and enthusiasts. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more!