As noted, better photos from both sides, of the open cylinder, muzzle, etc. would help. It looks like there is a good bit of wear on the leading edge of the frame and at the muzzle end, but that could be lighting.
Do you have the original box and papers, or only the gun? Any comment on the lock up, action, and timing? What condition is the bore in?
IMO, most buyers are looking for original grips, so while the faux bone might look nice to some, it probably detracts from the value.
I don’t have near the experience of others on here, but I say maybe $1500 tops if the wear in the photo is real (vs a lighting effect) and no box. Check Gunbroker for actual selling prices of that period without original grips.