Rather rough dial from a 1940's compression tester:
I figure I'll re-make it in Inkscape, but does anyone have a clue as to what fonts were used (or close modern equivalents)? I started looking at the numbers first as I figured that would be quite simple, but nothing I have installed already has a zero that's as narrow or slab-sided as the originals. The "Weidenhoff compression tester" text is pretty distinctive, of course.
I cleaned up the mechanism and it seems basically sound (there's a seal gone bad in the release valve, so it doesn't hold a reading right now), and it came with a metal case and loads of brass adapters - must have been worth quite a bit when it was new, but it's obviously been left in a damp environment for many years.
cheers
Jules