My neighbor Vernadene had a late 50's Kenmore dryer that was connected to a 50A circuit. They had a gas range at that time, so the dryer was connected to the pullout in the 100A fuse box that was intended for a range. Their washer at that time was a Maytag wringer. She got a new Kenmore 800 set in the Summer of '72, when they built on and did over the kitchen, including a GE Mark 27 range. The electrical service was upgraded at that time.
Our house (built in '52) orginally had a 100A service, and an additional fuse box was added when we got an electric dryer in '63. A new 200A service was installed in '73 when we got central air, with an additional 150A panel the next year for electric heat. These were replaced a while back with a new 400A service.
Most homes built after WWII had 100A service, unless they were very small, or had all gas appliances. In that case they may have had 60A.
I was in a very large house a few years ago that still had the main panelboard that had been installed in '49. That was a 400A service with Westinghouse circuit breakers. It has since been rewired with two new Eaton 225A panels. According to the owners at the time, central air conditioning was also put in back in '49.