It is a given that it is a 38 M&P I was just narrowing it down to the model 1905 4th change per S&W catalog.
There are no S&W catalogs that I know of using "4th Change". The factory simply called these revolvers 38 Military & Police. Roper and McHenry, authors of an early book on S&W, introduced the first collector naming convention for these revolvers by using change numbers to identify engineering changes made. 4th Change indicates the introduction of a new type of hammer block safety and was the last pre-WWII model so named by collectors.
A copy of a 1925 S&W Catalog for the K frame of the era is below.
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