A home built in the 50’s has a panel configuration like pictured. A main beaker panel with a breaker for a sub panel that houses fuses to a dryer outlet. Main breaker panel also feeds panel to the rest of the house. The feed in that panel has 2 black leads connected the the feed from the main breaker panel to a single breaker panel that goes to an outlet for the washer.
Obviously it is a pretty old system and it’s not likely that replacement breakers can be found plus it is only 70 amp service.