Thanks for taking the time Guy. Indicates that the gun was either new or very new when I purchased it. No box though. Bought it with a Bianchi #9-R underarm holster, not made anymore. Convenient carry rig.Model 36 serial 664879 was shipped in June 1968. Model 36 serial 673307 was shipped from the factory in August 1968. Model 36 716738 was shipped in February 1969. I would say August or September 1968.