The No. 2 Film Pack Hawk-Eye by Kodak is a 520 Film Pack camera produced between 1922 and 1925. It has a meniscus lens, a rotary shutter, and two reflecting viewfinders. Unfortunately, it is missing the strap and both the viewfinders are in pretty bad shape. The shutter seems to work though! Would make for a great addition to any camera collection.
Here is a link to the owners manual: http://www.brownie-camera.com/manuals/no2andno2ab/index.shtml