need an instruction manual for black and white "Simmons Brothers Omega Type A2" manufactured in New York with a serial number 1275XX I would guess this one was made in the mid fifties to early sixties. Mine works and paid 0.99 cents for it. Can't find an "A" model on web and I don't know if a "D' model enlarger is basicaly the same except for size.
Found one! In Canada of all places.
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