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Prismat

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Known Mamiya-Sekor Prismat Clones
Brand	Model	Also Known As	Mount	Shutter *
Mamiya	Prismat NP	Prismatic (in UK)	Exakta	Cloth
Mamiya	Prismat NP	Reflexa (in UK)	Exakta	Cloth
Mamiya	Prismat NP	Sears 32A	Exakta	Cloth
Mamiya	Prismat NP	Tower 32B	Exakta	Cloth
Mamiya	Prismat NP	Sears 32B	Exakta	Cloth
Mamiya	Prismat PH	Tower 37	Bayonet	In-Lens Leaf
Mamiya	Prismat PH	Tower 37A	Bayonet	In-Lens Leaf
Mamiya	Prismat PH	PCA V-90	Bayonet	In-Lens Leaf
Nikon	Nikkorex F	Nikkor J (in Germany)	Nikon F	Metal
Ricoh	Singlex	---	Nikon F	Metal
Mamiya	Prismat	Sears SLII	Nikon F	Metal
* NOTE: Cloth shutters travelled horizontally; metal shutters travelled vertically

Additional Note:
Although I have yet to discover one, I understand Mamiya also made at least two lenses for Nikon, identifiable (should you find one) as Nikkorex lens Sekor. If you have any production or technical information about these lenses, please consider joining my Collecting Mamiya 35mm Forum to tell us about them!