This gets into the sticky distinction between date of manufacture and date of shipment.

Let me give you another data point. My 1955 Target bears s/n S144516 which is 23 units ahead of your beauty. The records show that mine shipped in January 1958.

And yet another data point. My 1950 Target .44 Spl. (pre-24) bears s/n S145147. It shipped in April 1955.

They can be all over the map.

Yours is a beautiful revolver. I'm sure if you decide to sell it you will have an enthusiastic reception. I quit giving marriage counseling long ago, so I'll keep my trap shut on that.

Curl