Ricoh Auto Rikenon 55mm f1.4 for Singlex battery cover contemporary 4x5 monorail camera with

contemporary 4x5 monorail camera with indexed movements front and rear

while the back's serial number is 548

Frame counting and spacing are good

5 viewfinder correction lens for M series (model 14352)

There are Arca-style clamping surfaces on both axes

Ricoh Auto Rikenon 55mm f1.4 for Singlex battery cover contemporary 4x5 monorail camera withHere's some interesting trivia: back in the day, Mamiya built the Nikkorex F for Nikon, and they also built the original Singlex for Ricoh both with an F mount, weirdly enough. And while the Ricoh Singlex can take Nikon lenses, the Singlex F mount lenses like this Ricoh Auto Rikenon 55mm f1. 4 can't be used directly on a Nikon camera without modification: one of the bayonet lugs is a touch too long to fit. Nevertheless, flange distance is the same as