BBC Marconi Ribbon Microphone, BBC-Marconi Ribbon Microphone, Type AX, Inst. no 309047 P.S. 11780 A, with label Patent No 429307 & ZI/ZA 299 (possibly army designation). Iconic BBC broadcast microphone. Good condition, with one or two tiny bumps to base and wear on bracket. Housed in original wooden carry case, stamped, ‘LON - Obs, B B C’, includes looped BBC logo badge; untested.