Production ended sometime in mid 1954. The CO2 pistol was produced for about 5 years,and is much more common than the pneumatic version. Current research dates your pistols characteristics from about mid 1952 to mid 1953. A rather well made pistol that was to be later replaced by a much cheaper to produce BB semiauto repeater versionin Healthways lineup. This semiauto BB version was a much better seller and a much more profitable gun for Healthways.