Farny....S&W would refinish a revolver with the process it was using at the time the gun was sent in and not the "period correct" finish. However, this most likely pertains to the process used to blue a revolver as the process used to plate a revolver has not changed. In 1980, S&W changed from a hot oven or carbona blue process to a liquid blue process that results in a slightly different color (but still very nice).
I am in the southwest corner of Indiana.
Bill
I am in the southwest corner of Indiana.
Bill