Here is M4220's comments "I finally fell to the desire to have that 12 ga H.
Scherping that Kirby had for sale on vintagedoubles.com, it fills out the set of Scherping back action guns, Double Rifle 12.7 x 65R, Cape 12 ga x 10.25 x 60R, Drilling 16 x 16 x 9.3 x 72R, 12 ga S x S. I enclosed a couple pictures of them together