Close up view of # 321217's serial number roll mark. Magnum marked Single-Six with varnished walnut grips, serial number 321217. Whereas 22 LR and 22 convertibles were marked: RUGER.22 CAL. Magnum models were roll marked on the left side of the frame: RUGER SINGLE-SIX WIN. Ruger lumped serial numbers together for 22 LR only, 22 Mag, and 22 convertibles in this time frame. Willmar, The highest serial number for an Old Model Magnum Single-Six is 394740, so your gun was made in 1964, just after Single-Six convertibles came on the market.
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