This is a Ruger "Flat Gate" manufactured in 1955 (mint condition). This is the only Ruger in my collection. I acquired it, at the urging of a friend who is a very knowledgeable dealer.
The very early serial number, the flat loading gate (which was only produced for four years) and the condition of this gun all intrigued me.Ruger .22 Cal. Single Six (made in 1955) Flat Gate
Sturm, Ruger & Co. manufactured the original Single-Six single action (in various forms), from 1953 until 1973. In 1957 Ruger replaced the flat loading gate with a contoured gate. This specimen from my collection, was manufactured in 1955 and has the "flat gate".
When I can locate a club or association that deals with a particular group of guns I will provide a little information and link. I found such an organization for Ruger (see below).
RUGER COLLECTORS' ASSOCIATION - Co-founded in 1975 by the late Stephen K. Vogel and John R. Hansen, Jr., the Ruger Collectors' Association is an independent organization of Ruger collectors, not affiliated with or sponsored by Sturm, Ruger & Co., Inc. The association's members are dedicated to the study and preservation of Ruger firearms and memorabilia while promoting camaraderie and fellowship among those interested in collecting and exchanging information about these firearms.