BEING RESEARCHED UnIDed Aircraft Instrument Kollsman Poly-Plane Compensator NOT FOR SALE TIL IDed

This is an unidentified aircraft instrument of unknown vintage. The instrument is by Kollsman and is labeled as a Poly-Plane Compensator Type 758.

Circa unknown.

Approximately 3-1/4" in diameter and 4" in depth.

Glass/plastic, steel, brass.

Bolts, nuts, holes.

KOLLSMAN TYPE 758 SER NO. 1992 on front; KOLLSMAN POLY-PLANE COMPENSATOR PATENT PENDING; 4D 56(?) stamp on reverse.

This is from an accumulation of unidentified items which we will be listing more of over the next few months. Item will not be sold until it is identified. STORE LX8/12

7- (Very Fine-): The instrument shows some small areas of moderate wear.

As with all my artifacts, this piece is guaranteed to be original, as described.