I replaced an old Federal Stab Lock circuit breaker panel with one made by Square D. I've heard bad things about FP stab locks. Like failing to trip on overloads (which is the main point of circuit breakers). My father built and wired this house back in the mid 1950s, and at the time worked as an accountant for Federal in Newark NJ IIRC. So he got from there a bunch of breakers and panels, one of which was a stab lock. Never had a problem, but never had an overload either.
Dispite the above, I've heard that there is a demand for used stab lock breakers. Anyone want them? I have no way to test them in a manner that would satisfy UL, so they'd be as is no guarentee.
Catalog numbers look like: Stab lok 015 (1 pole breaker), Stab lok cat no 20 1 pole breaker, issue no AY44. Another is cat no 020. These all say "Federal Electric Products Company, Newark NJ USA" Not "Federal Pacific". There are nine of these that came out of the old panel, and some more in a box I saw some time ago in the attic. These all date back to the 50's. There's also a few that say "American" that are only a few years old. A double pole 30A, and a single pole 20A.
There's also the panel with 12 spaces, has copper buss bars.
Maybe someone wants this stuff to show trainees what Federal stab locks look like?
Call 1-800-843-697 Breaker King. Some times the will buy old breakers test and repair them then resell them to those who need to buy old style breakers. Do not know if they will in your case or what the will pay. Other breaker remanufacturers are out there