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I agree with this. I have seen 1920 DC Motor starters in use, They had no meters. This looks like it had two meters, and perhaps two switches. (Upper right and upper left.) Also I think the fuse holders on the back point to a generator.Since it looks like there were meters mounted on the panel, I'll venture a guess that it's a generator field rheostat and the meters were a voltmeter and an ammeter.