I'm glad I'm not the only who seemingly has a taste for "older" diagrams from that period. It makes me think of the same aesthetic roots of what's now called "cassette futurism" or "NASA-punk". Older engineering charts really feel like there was more care and thought put into each line or facet, even though I'm sure it's a trick of time.

I was a big fan of two fonts (Draft Paper and Parts List) by Beth Matthews [0] that call back to this era, you might enjoy them as well.

[0]: https://www.bethmathews.com/shop/partslistdraftpaperfontbund...