NASA listed its preferred typefaces for workstation panels in Section 9.5.3.1.14.1 of NASA-STD-3000, the Man-System Integration Standards.[0] Engraved lettering, in order of preference, was set in Futura Demibold, Gorton Normal, or Gorton Condensed. They're also listed on page 113 of the Databook for Human Factors Engineers Volume I Human Engineering Data,[1] along with other very interesting design guidelines.

The Gorton typefaces were part of the MASTER COPY type templates[2][3] produced by George Gorton Machine Co. for its Pantograph engraving machines, and were commonly used for civilian and military aircraft panels produced from at least the late 40s onwards, possibly earlier (the linked catalog is from 1947). Since many of those contractors were heavily involved in Mercury and later Apollo, it makes sense that they used the same engraving machines and type. IBM also used Gorton when it started producing double shot keycaps for its keyboards in the 70s. There's also a modified version, Gorton Modified, that was created by Signature Plastics for keycaps that's still used today for SA profile caps.

Unfortunately, the Gorton plotter fonts have never been revived for digital use despite their interesting history.

0. https://msis.jsc.nasa.gov/sections/section09.htm#_9.5_LABELI...

1. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/197100...

2. http://luc.devroye.org/fonts-80708.html

3. http://gorton-machine.org/forms/form_1309d/index.html