I'd agree, it certainly looks like the type of dynamotor which was used extensively at one time to power valve/tube equipment in mobile applications.
Whether the HT voltages you obtained would be those which were originally specified for this unit is hard to say though. 600V D.C. wouldn't be at all unreasonable for high-power transmitter finals, but 360V sounds a little on the high side if it was for feeding the general receiver and signal stages. If used for R/T, it might have been used for supplying power to the modulator, which on an A.M. transmitter needs a substantial amount of power (about 50% of the power needed to generate the R.F. carrier). The other stages would then be run via decoupled reduced voltages, as in line-powered equipment.
