black, air ministry serial no. 2441, with modification record: 10D/13045, serial: 2441, MOD: No: 157/1, DATE: 5 . 6 . 45, in G condition, untested, missing at least two internal valves to rear right of unit when disassembled, others appear to be present, with original internal wooden panels stamped "aero", two removed due to failed adhesive but present, power input interface appears modified, originally purchased by the vendor in the late 60s directly from the Ministry of Defense's surplus,