WWII Navy CRR-74028 Heterodyne Frequency Meter LM-21 Serial 285 w/ MATCHING Book For Sale

A genuine piece of World War II-era U.S. Navy radio test equipment — the CRR-74028 Heterodyne Frequency Meter, the core instrument of the Navy's crystal-calibrated Model LM frequency indicating equipment series. Manufactured by Bendix Radio of Baltimore, Maryland (the "CRR" prefix is the manufacturer identification code for Bendix Radio). This is serial number 285 — an early production example. Includes original calibration book with metal cover.

The LM-series heterodyne frequency meters served aboard U.S. Navy ships and shore stations throughout World War II, calibrating the radios that kept the fleet coordinated across every theater of operations. Serial number 285 — a low number suggesting early production — makes this a particularly notable survivor.

Sold as-is, untested. Ships carefully packed.