Hotline, yes, that is an "all-in-one." The lower compartment contains both the main breaker, as well as the branch circuit brealers.
A more common design is split vertically, with the meter on one side and the breakers on the other.
Alan ... I did NOT make that up. The gent had clearly just watched a training video, and had no idea as to how houses were built - either in 1958, or today. A town must have it's priorities in order ....
Norcal, you continue to amaze me. Indeed, I can't say I've seen any 1958 houses with breakers at all; fuses seem to be the rule, and this house had a larger fusebox than is typical. I suppose it's a good thing that around here "rain" is found only in the dictionary