M37 M42 M37 x 0.75 Female to 42mm x 1 Male Screw Camera Lens adapter|Lens Adapter| - AliExpress
M37-M42 M37 x 0.75 Female to 42mm x 1 Male Screw Camera Lens adapter - AliExpress Consumer Electronics
M37 to M42 37mm 42mm (Asahiflex Lens to M42 Lens) adapter Ring 729436248441 | eBay
RARE] Asahi Pentax Takumar 83mm F/1.9 for M37 Mount w/ M42 Adapter from Japan | eBay
Amazon.com : M42-FD Lens Adapter, M42-FD M42 Screw Lens for Canon FD F-1 A-1 T60 FTB Film Camera Adapter, for Zeiss, for Pentax, for Praktica, for Mamiya, for Zenit : Electronics
M37.5 x 0.5 Male to T-Mount Female Step-Up Adapter | Edmund Optics
Asahi Pentax Takumar 83mm F/1.9 Lens for M37 Mount w/ M42 Adapter from Japan (C1749) | Big Fish J-Camera (Big Fish J-Shop)