Altair 8800 Computer
From Wikipedia:
Micro Instrumentation and Telemetry Systems (MITS) was an American electronics company founded in Albuquerque, New Mexico that began manufacturing electronic calculators in 1971 and personal computers in 1975.
The Altair 8800 is generally credited with being the first broadly available microcomputer system. It debuted on the cover of Popular Electronics magazine in January of 1975 (albeit in the form of a prototype with a different nameplate in Microgramma), and was available in kit or assembled form, across different model variations, over the subsequent two years. The brand nameplate for the Altair 8800 and also the Altair 680 used the Tuxedo typeface, as did some of the accompanying documentation.
Cover of the documentation for the Altair Computer System
The front panel of an Altair 8800 at the Computer History Museum in Mountain View, California
The labeling for switches and lights on the front panel appears to be in Helvetica. The slight rounding of the letterforms is probably due to the application process.
The Altair 680 was announced in November 1975 and shipped in May 1976. “MITS” is in outlined Helvetica.
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See also Safa’s contribution about Popular Electronics magazine:
The back cover of the first issue of BYTE (September 1975) has an advert for the Altair.