Thanks for the information and the advice!It's a .38 M&P (Military and Police) model from the earlier part of the 1920's. They're excellent shooters.
Looks like the gun is pretty dry. I'd recommend that you get some spray gun oil like Breakfree CLP , remove the grips (loosen the screw and tap the frame to loosen- never pry the grips off), and thoroughly spray the gun inside and out.
Let drip dry and wipe down the exterior with a clean rag, then wipe out the bore and chambers with a patch.
A little maintenance and you'll get another 100 years out of it.