Looks like a cocking rod gun with side pivot top lever. Only one I have of them is an E grade, bottom of the line at that point, 10 gauge. certainly not the one in this pic, only has scroll engraving, no animal scenes of any kind. I would love to have one of those rod cockers in a light 16, but at this point in my life if I was to find one I wouldn't be able to afford it. Wouldn't mind at all if it was a thumb push opener, most of mine are the large single hook guns.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra