History Cool "Garage Find" Buick Pinion Setting Tool

I was talking to my Neighbor that's doing a Garage "Clean Out" (Her soon to be Ex's "stuff") and came across this while taking photos for her.
It has all the settings for Buick Rear-ends up to 1942!

Now this is the ONLY cool thing that was in the Garage that I've come across so far as the Guy was really "in" to Saab's...(70's-80's).

(click on the pics for the BIG size)

 

thats a pretty cool old tool they sure dont make tools like that anymore even has a cool wooden box