The Ricoh Diacord L is one of several twin lens reflex cameras built by the Riken Optical Company in the mid to late 1950s. The Diacord L (also known as the Diamond L) has a couple of identifying features. First off, the Diacord L uses a dual lever focusing system. The front standard of the camera is focused by operating either of two levers, one each on each side of the camera, in a seesaw fashion. It is a nifty system for focusing as it allows for either left or right handed focusing, allowing the user to prioritize the other hand for film advance or shutter/aperture adjustment. The other noteworthy feature with the Ricohflex Diamond L is the addition of a selenium cell light meter located behind the nameplate of the camera. Meter readings are displayed on a large metering knob on the side of the camera and translated into LV units which correspond to specific aperture and shutter combinations.
The Diamond/Diacord L has a four-element Rikenon 80mm f3.5 taking lens complimenting an f3.2 viewing lens (one of the faster viewing lenses found in this whole family of cameras). The taking lens is set in a Seikosha-MXL leaf shutter with a typical top speed of 1/500.
There isn't a ton more to this camera. As far as TLR cameras go, it is fairly basic but a solid all-around camera and a great twin lens for a photographer on a budget.