Hi All.
I just managed to pick up this totally complete and 'un-used' Onan Electric Plant OTC-33B multi point battery charger and jump starter.
It still has delivery tags on it and various transit seals still in place. Complete with its huge transit case with accessory compartment with all the spares, leads, manuals etc.. A real time capsule.
Anyone hazard a guess from the serial number..I have not found any dates on it yet.. Am guessing about 1943 ish.
Rich.