Walmeck M52-M42(17-31) 17mm-31mm M52 to M42 Mount Lens Adapter Ring Macro Extension Tube Helicoid Lens Focusing Adapter Ring for Macro Photography - Walmart.com
M42-S/E M/with helicoid - KIPON
Super Takumar M42 200mm F4 Lens. This is a Superb Macro Lens. - Etsy Israel
HIKROBOT MVL-AF3528M-M42 | RMA Electronics, Inc.
Industar 61 L/Z MC 50mm F/2.8, Macro USSR Lens For Zenit, Pentax. M42 | eBay