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Ricoh Zessan
France Version française
Photos by VB text by VB. From the collection of VB. Last update 2013-04-26 par Vincent Bernardin.

Manufactured or assembled in Japan from (Circa) 1940 to 0.
Index of rarity in France: Rare (among non-specialized garage sales)
Inventory number: 2620

See the complete technical specifications
Chronology of cameras Ricoh 
History of the brand Ricoh New window

Although it was sold by Riken, the Zessan was build by Mori.
The 3 lenses optic, Roico or Seica  depending on the unit, being produced by Riken .
The optical block  is attached to a collapsible tube.
The Seikosha shutter is enjoying a kind of remote-trigger.
Normally with this type of shutter "Everset" arming and triggering are on the heels of one to the other.
When inserting a pin or needle into the hole below the optical then actuating the lever,  the shutter is armed but the triggering is delayed, the shutter fires only when the needle is removed.
So with a needle and thread long enough you got a remote control... so you don't need to run to be on the picture.
All "litch" shutter don't have this feature (see the Minion), but the Zessan shares this with the Kinsi for exemple.

Ricoh Zessan