A 5-pixel x-height suggests the IIc's native font. I think the other labels might have been drawn pixelwise, because you're right, they're sized wrong and the l

A 5-pixel x-height suggests the IIc's native font. I think the other labels might have been drawn pixelwise, because you're right, they're sized wrong and the letterforms are weird, e.g. the 'm' in 'Fremont', the 'a's in 'Hayward' - I think they're stretched 1 pixel in each dimension, but it doesn't look nearest-neighbor to me so much as hand-fitting to size. Perhaps they wanted to scale up all the labels to read better on screen, but found hand-drawing the upscaled versions to be unexpectedly time-consuming and decided to stop with a couple of them still drawn in the native font.