Hard to tell, exactly, but it appears to be a standard 4" Model 19, Hogue monogrips, I think I see a pin, so it would be pre-1983, meaning that the chambers are also recessed.
Either a fair amount of wear, or just some light shine.
Doesn't appear to have a red ramp, so it wouldn't have a white outline.
Picture's too dark to tell the location of the gas ring, but I'm going to hazard a guess that it's a 19-3 or a 19-4.