Vintage Riken Steky IIIb Subminiature Camera. Aperture control f3.5-16. Shitter cocks and releases in one stroke with one speed. These are from my grandfathers collection. They have been looked at but not repaired or made to be in working order. They may need a simple battery, or adjustment. However, they have been in the family for decades and stored in air conditioning to keep the integrity of the cameras.