I used to be in the antique furniture business many years ago but not antique rifles. Do the rust / discoloration splotches on the metal in any way show transfer of oxidation to the wood at these specif points? The edges of the metal flats look almost pristine in sharpness and are without any dings or wear - that I can see form the pic. In fact, I can not see any deformation or wear on the edges of the metal at all, which is unusual on anything that has age. But - I can not see real closely so I am just commenting on what I can see. lastly, are there any signs in the wood of normal wear or perhaps some damage from insects that matches with where metal and wood meet?
Not being an alarmist here but it looks a bit too crisp.