Hammond's Handy Star Finder

I suspect you are pretty keyed up after seeing all those Rossig wheels, so I thought I'd give you a break today. This is Hammond's Northern Hemisphere star finder. The blue wheel is ten and a half inches across and, as you can see, it's a bit tattered. The copyright date is 1950. Still, I think it's a real looker. I love maps of the night sky like this.

The reverse side has all kinds of information, including a schedule of meteor showers, one of which is going on right now. I wasn't aware there was a star called Vindemiatrix.

Starfinder wheels like this are pretty common; we have at least five. This one is certainly the most handsome, I think.

​UPDATE (7/29/16): I found the original envelope!