...not exactly a tool watch, but a nicely crafted tool by a respected watchmaker in the 30's. Sorry to get off topic, but was excited about a new arrival.
The Jaeger-LeCoultre Compass Camera was produced in 1937. Machined from solid aluminum, it is the smallest 35mm camera ever produced. Considering this was manufactured in the 30's it was no small feat and required the expertise of a company like Jaeger-LeCoultre to pull it off. The camera was pretty advanced with more features than most modern cameras today all crammed into a tiny package just over 2" square.

I have been searching for a nice example for 20 years, and this week two of my grails arrived. The Compass camera and a nice one owner Omega 2914 shown for size comparison. The lens barrel on the camera collapses to form a very small pocket camera.

Hodinkee wrote a nice piece on the camera recently:
https://www.hodinkee.com/articles/jaeger-lecoultre-compass-camera

and on the 80th anniversary of its creation, Jaeger-LeCoultre created an exhibition featuring work commissioned by photographers using the camera:
http://www.jaeger-lecoultre.com/us/en/chronicles/news-events/compass-camera.html

I collect both tool watches and vintage cameras...I love it when the two hobbies collide.