Hard to find Buehler 1-piece base. This base works with 1-piece and 2-piece Buehler rings, which have a post style front ring mount and windage screw style rear ring mount.
Pre-war base fits rifles with serial numbers below 66,350 and requires a non-factory hole in the rear receiver bridge.
Post-war base mount to the factory holes on all rifles with serial numbers above 66,350, other than H&H magnum rifles.
These are steel blued bases, in very good to excellent condition and include mounting screws.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE