Airesearch
Cabin Altitude/Pressurization Selector Set (2 instruments) B-50 KC-97
$39.50
This offer is for a vintage 1950s Cabin Altitude/Pressurization Selector Set of 2 instruments: Cabin Altitude Pressurization Selector and the Pressurization Rate of Change Selector, made by Airesearch, which appeared on the engineers panels of the Boeing B-50 Bomber and KC-97 Stratotanker. See photos of the diagram and descriptive text from the B-50 Flight Manual. Both measure 3.25in diameter and ~6in deep.
The dial markings are clear and the glass and case are intact. See photos.