
The OM Single-Six Convertibles started in 1961 with the serial number of 162xxx and went to 1973 with a serial number of 21-56105. So, we look in the RENE Guide, under the Single-Six Convertibles, and the list of serial numbers, by the years, allows us to say your gun was made in 1967. If your gun had the adjustable sights, it would be a "Super Single-Six Convertible." The Magnums were dropped & Convertibles were offered. It was because folks were asking for the other caliber for their guns.

In 1959, the Magnum Single-Sixes were produced, and later on, when they decided to make just one model, they made convertibles. Any fixed sighted Single-Six with a serial number before 150,000 did not have the mag cylinder. The number places it in the production era after the magnum cylinders were being added to the Single-Sixes.

So, as you already know, your gun is a FIXED sighted gun, and that makes it a "Old Model Single-Six Convertible." It's not marked "magnum" or it would have a different serial number block. MUCH better than any other resource for us. You can join RENE, and Chad (chet15) has a Reference Guide that is INVALUABLE to collectors. As FM alludes to, we use the RENE Reference Guide for information.
