SAFE shooting never devalued an old gun in good condition unless it was overdone.... or if the rifle was unfired in the first place.
As one example, I am NOT firing one of my Mark IV Martini-Henrys, it having survived since 1887 in an unfired state.
On the other hand, if I owned THIS baby, I really don't see how I could POSSIBLY resist the urge to blow just ONE little ball down the range.... or perhaps 2 or 3 or.... well, you get the idea.
AMAZING find!