New Britain VL-139 Split Lock Replacer Valve Keeper Tool

In good working condition, but the chrome finish is showing signs of age and use.

From the 1953 New Britain catalog:

"The perfect, compact Tool for replacing all split type valve keys on single and double-grooved valve stems and where the new convex locks are used. Requires a minimum of working space. Sliding base prevents key dropping into motor. It's very simple to load. Designed for easy operation with VL-151 Valve Lifter or "C" Type Lifter with VL-141 straight jaws, or any good valve lifter."