Hi TG I'm new to your site but glad to discover it! I am tasked with creating a large scale replica of the Apple 1 mother board for the upcoming exhibit at Computer Museum of America. I'm stumped on the font used for this identifying panel. There are quite a few fonts that show similarities to the distinguishing r, m, y, t and 7 in this font, bit I haven't found one with all of them. Clearly, it needs to have been designed before 1976. Your ideas greatly appreciated! 

Is that made from solder? It doesn’t look like it is printed and therefore not a named print font. Looking at other images, it has some Helvetica vibes. 

My hunch is that it’s some version of Akzidenz-Grotesk/Basic Commercial adapted to and/or distorted by the reproduction process.