Not as unusual as you might think. I have one mounted around that size. Shot it in the High Sierras in Calif in 1969. Look at my Album, last picture (only double) on the bottom. I have also seen several like it here in Colorado. They are pretty unusual looking and do make a great wall hanger.
Cowboy Action Shooter; Endowment Life Member-NRA
The Original Rocket Scientist-Retired
"My Father always considered a walk in the mountains as the equivalent of church going."