If the grips are original to the gun, the serial number may be penciled on the back side of the right grip panel. If you post the ser. # you see on the frame & rear of the cylinder ( as well as the barrel, because, as Murph says, that's where a serial number is seldom worn away,) so check carefully between the "ears" on the rear of the barrel, as well as the bottom of the barrel latch. Both areas would have serial numbers that won't be worn away, if the gun's a S&W, as I beleive it is. It's also possible the red mottled grips are replacement from a revolving rifle. Post the serial number here and I may be able to tell you when the gun was made from my records of Model 3 DA production. Ed