US Army Air Forces K-20 Aircraft camera
Described as 'a lightweight handheld' aircraft camera this thing is SOLID. Shot 20 foot rollfilms of 4x5 negs. Three shutter speeds (1/125 - 1/500) but full range of f-stops. Pretty much every US bomber in WW2 carried at least one of these. Can fire as fast as you can push-pull the handle.

US Army Air Forces nomenclature plate.

Dial set shutter speeds and apertures.

Used these large roll films for 4x5 negs.