This Garwin Kollsman Altimeter is as removed from a Cessna 172 and is represented as a core. Knobs spin and move hands and the altitude does fluctuate with the barometer as-expected.

This unit Is part number 22-980.

Condition is as-indicated; however, the part has not been checked by an A&P / IA. As with any part you install on your aircraft, your A&P should perform due-diligence and ensure airworthiness prior to installation.