According to page 45 of the February, 1955, issue of Southern Appliances, this is model WD660M, GE's first free-standing combo. That is confirmed by an illustration on page 49 of Appliance Manufacturer's General Electric Review in January, 1955. This was the machine with the two speed transmission and a drum with 4 baffles. We have the undercounter version of this machine in the cadet blue GE modular kitchen we took out of a home in Virginia.