Zinsco Magnetrip Panel
Sure is. Right next to a nice Wadsworth side-arm disconnect.
Well, at least it has copper bus bars
I found that interesting as well.
That was their original bus-bar design, prior to using aluminum. . .
Panel was disclosed as original to the home.
Home built in 1952.
Last Home Addition / Modification occurred in 1962.
Zinsco introduced AL bus bars in the 60’s with copper bus bars prior to that. Prior to the copper bus bars, the “Magnatrip” breakers had a line-side and load-side conductor, or a screw-tap for the line side of the breaker - no bus bars.