.This is  a  Mackenstein Francia Jumelle camera that dates from the late 1800's. Mackenstein went out of business in 1914.
This is a very strange camera. The lens is a Krauss-Paris Zeiss Tessar 112mm f6.3. The focus is by rack and pinion and there is a footage scale on top. There are two finders.
The film magazine is on the back and holds 12 plates. The handle allows you to pull the magazine out of the body to replenish the film.
This is a collectible and rare camera and is sold as non-working condition.
Includes the original case.