Welcome to the forum. A couple of answers. 85xx dates to 1933. The stocks are not original to the gun. They are the coveted full checkered target stocks used on E/I frame models from circa 1954 to 1960 give or take. Your stocks are probably from 1954 because they do have the early style medallions which we recently realized were used on them initially. Your OMT originally had full checkered service size stocks with the same medallions. There should be no danger of wearing the action abnormally with double action shooting as long as your pull is smooth. Overly rough double and/or single action shooting can accelerate wear, but that is in the category of abuse rather than use.