The Phaostron 666 Multimeter from 1958.

https://wereboar.com/projects/index.php/2024/09/09/the-phaostron-666-multimeter-from-1958/

I was given this multimeter by a retiring co-worker. While it's not of much use today, the overall look at the fact the thing is built like a tank really made appreciate the thing. Check it out on my project page.