This pair of Ruger manufactured second variation checkered black synthetic grip panels with the solid backing and factory black phoenix medallion is for the early Mark I semi-auto rimfire pistol with the unmarked Pre- "A-100" grip frame which has the magazine button flare on the right side of the frame. This pair of grip panels are in very good condition with honest wear. (file photo)

Note: Ruger Mark I semi-auto pistols with the following serial numbers have been observed with this part:

No Prefix: 127144, 129129, 166765 & 210887