I received my Standard Catalog of Smith and Wesson yesterday and wanted to post a little background on this pistol from the book. It is .38 M&P model 1905 4th change and the serial number is 2915XX. The 3rd. change ended with serial number 241703 in 1915. The most significant difference from the 3rd. change was the addition of small hammer block. "Heat treated cylinders began at approximately serial number 316648."
One of the variations noted in the book, dates my revolver to 1919. "Army Ordinance Special Order of 50 revolvers, all with target sights and 6-inch barrels, blue, turned over to an Army Ordinance courier on June 3, 1919, carried directly to the dock in Hoboken, New Jersey, and transported to France via S.S. Kroonland for use by U.S. Pistol Team in Inter-Allied Games held in France June 22-July 6, 1919. Some, but not all, of these revolvers were later inscribed and presented 'as trophies' to members of the U.S. team, which won the pistol competitions. At least three three of these inscribed revolvers have surfaced 291024, 291046, 291132. See U.S. handguns of WWII: The Secondary Pistols and Revolvers by Charles Pate (1998) pp. 85-87."
I'll hold off on shooting the pistol until after I change the caliber on the reloading press. My 38 special reloads are on the warm side and will want something lighter for this one.