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Not sure when the older Western Auto stores closed; but the frame design looks like what one manufacturer (perhaps GT Dyno) referred to as the triple triangle or the like.
Black paint and chrome-plated steel rims should clean up nicely.
I put fenders, spring saddle seat, balloon tires, kickstand and a rear rack on my 21-speed mountain bike, for my grocery-getter bike.
I also have some more comfortable handle bars and attachments to integrate some day, (if the wires might reach).