thanks for the info all the numbers match. It's a 38 special.With a 6 digit serial that high and a square butt, it has to be a .38 Military & Police Target from late in the 1920's. Unfortunately, I can't make out a caliber stamp on the right side of the barrel. The grips could be original if it shipped in 1928 or 29. Workingdead, carefully remove the grips...don't pry them or you may damage them. Just loosen the grip screw completely but leave it in the grips. Then push on the head of the screw to pop off the right panel. Look on the back of that panel for a penciled or stamped serial number. If the grips are original, the number on the back of the right panel should match the one on the butt.
The .38 M&P Target carries a premium over a fixed sight model given similar condition and all original parts. You should find the serial number you posted under the barrel, on the breech face of the cylinder, behind the extractor star and on the rear of the yoke arm as well as on the back of the grip panel. If all those parts have the same serial, it is all original and worth around $600-700 in the condition I see.