Which model number? If P&R, it's an older one, probably a Model 27-2. The Serial number will have a S or an N prefix.
Whatever. M27s are pricey, often more than a grand in good condition, and, in my opinion, worth every penny. I just got back from the range shooting my 4" M28-2, made in 1966-67, and it's wonderful.
My 6" M27-2 is more accurate than my wife's Colt Python. Really, for me, the M27 & 28s are the best .357s available.