Up for sale is a NOS, U.S. Military, RCA, JAN-CRC-12SK7 Vacuum Tube, FC1 Tested, Strong. I recently acquired this item included in a large quantity of vintage 1940s, 50s, and 60s radio and television tubes, gauges, meters, manuals, parts, etc. from the estate of a gentleman who was a radio man in the Navy during World War II, and thereafter associated with WSM radio in Nashville Tennessee. It is an extensive collection ranging from items related to his Naval career, and his subsequent work at WSM. There are a great many New Old Stock items in original packaging such as vacuum tubes, and mid century radio parts, as well as used parts that he had simply saved for repair use over the years. All photos are of the actual products being offered. Please feel to take a moment to visit my eBay store and browse the other treasures I have listed. All fragile items will be shipped fully insured for the final purchase price so you may bid with confidence.