I recently purchased a used Model 66-2, 2.5 inch pre internal lock with S&W synthetic rubber grips. SN is 271K249.Gun actually has the stamp of 66-2 with a #1 overstamped on the -2 also. Could have been a factory mistake and they restamped accordingly. Great looking gun with good balance, tight lockup, clean bore and smooth action. Revolver has markings from previous law enforcement inventory #30760. Weapon shows signs of slight holster wear and minute abrasions. Local gunsmith checkedout and says it is at 95 percent. Looking for info on date of manufacture and any other information I can obtain.