Alright here’s a real obscurity for you. JOHNSON was a brand/dealer of ‘musical merchandise’ in Brandon, Manitoba Canada in the 1940s/50s. I’ve scanned the 10 pages from their circa 1951 catalog (the date is a guess based on the particular microphone models available in the catalog). I’ve omitted the pages featuring luthiery parts, electric razors (!), etc. Amplifier models featured include: The Johnson Vibrante, Maestro, Johnson Junior guitar amps; and the Johnson M1, M2, M3, and J1 PA heads; plus Hofner classical and archtop guitars, mics from a few makers, Celestion Rola G-12, P-44, Z10Z0 speakers, plus pickups, etc.
For a few words about JOHNSON and its founder Albert Johnson, plus photos of many later models of Johnson amps, visit this site. The most interesting fact: these amps were not re-branded pieces from another manufacturer; they were in fact unique designs built on the familiar+dear Hammond chassis.