What is this "tintype" camera in Buster Keaton's "The Cameraman"?

Last night I saw the 1928 Buster Keaton film: "The Cameraman" in which he plays a newsreel photographer (using a hand-cranked 35mm camera). Prior to getting hired at the news company, he works the street as a tintype photographer using a camera that is even described in the film as a "cocktail shaker". Anybody have any idea about this device?

https://goo.gl/images/S8c2XE

Not the same, but very similar:

Talbot Errtee Button Tintype Camera

https://www.google.de/search?q=Talb...hXNsaQKHV4oB0MQsAQIMA&biw=988&bih=546#imgrc=_

I know you didn't ask about it, but the hand-cranked motion picture camera is a Prevost 35mm made in Italy...