I am seeking information about these grips. I understand that the turned metal washers were used from ~1935-1946. I was wondering if the age of these could be narrowed down to a particular year based upon the markings shown on the washers. (U. S. Patent number and Smith & Wesson.) any input appreciated.
The short answer to your question is "no". The Pre-War Magna grips first appeared on Registered Magnums in August 1935. The washers on the early Magna grips were unmarked. Although there are a few outliers, the use of Magna grips such as pictured in your post essentially came to an end on the Pre-War .357 Magnums in December 1940. I do not know exactly when the washers on the Pre-War Magna grips transitioned from unmarked to marked with the patent number etc., but my guess is sometime during the 1936/1937 timeframe. Perhaps someone else can give you a better idea of when that transition occurred.
You can, however, date your grips from the serial number on the right side grip; it looks like 61545 to me - that would probably be about May/June 1940.

Last edited: