120/240 Service
I certainly don't think it was rare in the 1950's; definitely not for new construction, as I believe the code required it for any service over 40 amps.
My house was built in 1953, and originally had a 100 amp fused service - a Wadsworth panel with pullouts for main lights, and range. There were six plug fuses below. There were three separate fuse boxes added to the side for the water heater (1958), disposer and dishwasher (1958), and dryer (1963). The 30 amp dryer circuit was tapped off the main lugs, ahead of the fuses. The other two boxes were connected to lugs below the six fuses, controlled by the main lights pullout. These were all replaced in 1973 with an FPE 200 amp breaker panel (since replaced by Eaton CH equipment).
Even in the mid 1930's high grade homes had 120/240 service. My dad's uncle and aunt built a new home in 1936. Not a palatial mansion, but a decent medium size house - around 2500 sq. ft., not including the full basement. I remember two panels in the basement. One was a Westinghouse (100 amps) that had probably 15 to 20 120 volt circuits, each had a fuse with a switch next to it. Next to that panel was one for 240 volt circuits, which included a main for the other panel, range, water heater, and another had been added for a large window air conditioner sometime around 1950.
This panel had no visible fuses, but they were behind hinged doors that had a handle on the front. I'm nearly certain it was rated at 200 amps, which I'm sure was considered large for that time. Unfortunately it was all replaced with circuit breakers in the late 1960's.
Since dryers were relatively new at that time, I'm sure even a lot of homes that had 120/240 service didn't have a circuit running to the laundry room. If the incoming service was in the basement close to the laundry room, such a circuit could usually be run without too much trouble or expense.