Hi, im looking at two guns the seller claims is mod15. Both are with 6" barrel and patridge sight and adjusteable rearsight. One is stamped mod15-1 or 15-4, it is hard to tell. and has serialnumber K472635. The other one has no modelmarking on the frame when cylinder is opened but is stamped only "V". Opposite, on yoke, is stamped "G". The only number seller finds is 26108. Wath am i looking at here? I have not seen the guns, only sprikende to Jim on the phone.