Aneroid Barometer according to the patent number. 

I have no way of knowing if this works. The red needle moves. The yellow is a sticker on the front that I haven't disturbed. 

5" square and 1.75" deep. 

The only one of its kind after extensive research.

The case appears to be wood veneer over wood. It is a little worn as you can see in the photos. 

I ship same business day.