was at my local gun shop today,he has for sale a revolver he has marked as a 1917.45 cal.it has a bright blue finish,5 and a half inch barrell,half moon front sight,square notch rear,un shrouded extractor rod,reads s&w d.a.45 on left side of barrell.they say serial number is 2686.that is the only number i noticed on inside of crane,it does not have correct stocks,they cover the bottom of the frame.i didnt check other barrell markings.i am going back weds.to check it out more and will have him remove stocks to get a better look.i would think it is a 5 screw.they want $500.00 for it.i will let you know anything else i find out.it is in 90% or so condition.thanks curt.