Download the entire 12-page Primo Microphone Catalog Circa 1980:
DOWNLOAD: PrimoMicrophoneCatalog
Models covered, with specs and photos, include: Primo CMU-503 and P-77, P-88 ‘professional’ studio microphones; UD-876M and UD-959 Live Sound mics; and a huge range of general-purpose stage mics including: Primo UD-905, UD-876, UD-866B, UD-871B; Electret Condenser models EMU-4520, EMU-4516, EMU-522, EM-518, EMU-4517; plus many more mics and accessories.
From what little information I can gather, these mics seems to have been made in Japan and then sold in the US by ‘primo,’ which also made telecommunications mics and/or mic elements. I have never come across one of the these units. Anyone?
Best half-tone cover image ever, btw.