Another good forum is
http://www.jouster.com/cgi-bin/pistol/pistol.pl? and they don't require registration.
It may be a trick of the light or the camera, but that pistol looks to be heavily buffed with corners rounded and holes "dished". You indicate it is plated, but the picture seems to show it as blued or reblued and I don't think the grips are factory.
The four digit serial number would indicate it was made in 1929 or 1930, the first years of production.
An all original .38 Super of that era in new condition could bring $3800 or so, and more for factory nickel, but any use or change of condition brings the value down pretty quick. A reblued or replated pistol would run closer to $500.
HTH
Jim