Letraset’s Pump Bold (1970) with a modified R, for the Heavy Ultra Metal effects pedal from Beatsound’s Applause brand, featuring an “original circuit of Japan” by Digital Technics. “Applause” looks like a condensed Univers. While the knob labels use Helvetica, “digital switch” is probably Akzidenz-Grotesk.
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Apparently Pump was used for a whole line of Applause products. Here are a few more effect units as collected in the Effects Database maintained by Bart Provoost.