This is original equiptment from a house built in 1972... Just in the past year I've ripped out at least 40-50 of these... also in that time, I think I replaced about 10 FPE, another 10 Bulldogs, maybe 4 or 5 Bryant/Westinghouse, a Square D "XO", a Trumbull, & a seriously prehistoric one that had an "E" with a diamond around it as the only legible marking left.

For some reason, Zinsco was a seriously popular brand out here in So California in Tract-Homes built anywheres from the 50's - into I think the early 80's..

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-Randy