That is a bulldog panel....later to be known as a ITE "pushmatic" panel.....

ITE electric still manufactures these breakers (at least in the smaller sizes that U.L. still allows)

An ITE P120 is a singlr pole 20 amp, An ITE P220 is a double pole 20 amp...etc, etc, etc.....

Last I heard U.L. had pulled the listing for all the larger amperage breakers and they were no longer allowed to be manufactured. I think I had heard anything bigger than a 2 pole 50amp is no longer obtainable...but thats heresay and I'm probably wrong...

They are still availible from some breaker remanufactureing/reconditioning outlets but as KJay said the costs for those are downright frightening and besides where is the manufacturers backing in case the place burns and you get named in a lawsuit? Is a little piddling company like miami breaker that resells these things going to help?....I don't think so....

For the most part when confronted with a pushmatic nowadays I automatically start thinking service change/upgrade...my $0.02......