My late father-in-law was a watchmaker who apprenticed in Germany just after WWI.  I got what was left of his watchmaking tools at his passing (he'd sold most after his retirement).   After years of not doing anything with them, my wife suggested something along the lines of "When are you going to throw out those suitcases full of my dad's tools?"

 

I have an acquaintance who's a clock repairman, so I called him and offered to him or his buddies in the watch/clock club.   He came out and sorted through them and suggested I might want to keep this.   It's a spring loaded caliper.  Measures to 0.1 mm, just right for my hand-cut dovetails ;-)   Pretty cool, huh?

 

The other tool I have is the hammer my dad used to build the house I grew up in and learned woodworking with.

 

third try:

Edited November 21, 20178 yr by Ron Dudelston
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That is absolutely cool Keith. I'm gonna' bet it's darn accurate too. Looks like it's made from tool steel...the spring arm is amazing. Even if you don't use it, it's a display piece. Thanks for showing it.

That is darned cool.  I love how the spring was split out of the arm.  Numbers are just so readable too.

Wow that is very nice. I love old tools. I have quite a collection and still adding to it. That is a nice piece to save.