This Ruger manufactured second variation magazine body with attached chrome finished base lacking all other related parts is for the earlier Mark I semi-auto pistol with the earlier unmarked pre- "A-100" grip frame having the magazine button flare on the right side and is in very good condition with light wear and a few specks of surface rust. (file photo)

Note: Ruger Mark I semi-auto pistols with the following serial numbers have been observed with this part: 129129, 166765, 210887 & 451514