4literranger485: Sorry to take so long getting back to you - I've been out of town on a short business trip. There are a lot of Model 64s around, so values are not as high as for many other models. Depending on condition and where you're located, I'd say somewhere in the $350 - $400 range. The pinned barrel makes it a bit more desirable to some (like me!), but I don't believe there's any premium for the early tapered barrel models (production was changed to heavy barrel only in 1973, pinned barrels deleted in 1982).
HollowpointKid: That's not a valid S&W serial number. Please look at my response to 4literranger485 a few posts back. If you post the SN from the butt, we'll get you the info you're looking for.