Vintage Wollensak 2” (50mm) f=4 Enlarging Pro Raptar Enlargment Camera Lens

Description

Vintage Wollensak 2” (50mm) f=4 Enlarging Pro Raptar Enlargment Camera Lens.
The lens is fully functional and has clear optics. Front metal lens cap included. As pictured.
The Wollensak Enlarging Pro Raptar 2" (50mm) F4 is a 6/4 Plasmat and a fairly uncommon lens. These were made in around the 1950-60s although I'm not sure when Wollensak stopped making them. They are a plated brass lens, like other Wollensak lenses, heavy and made to last.
The 'W' inside a larger 'C' is the symbol for 'Wocoated' which is Wollensak's lens coating. Kodak used an 'L' inside a circle to indicate that their lenses were 'Luminized'.
The Enlarging PRO Raptars are quite an early 6/4 enlarging lens so were probably it-and-a-bit in their time with relatively few other 6/4 lenses on the market, Kodak's Ektars were mostly 5/3 Heliars or 4/4 Dialytes.
The non standard mounting thread required a custom adapter ( https://rafcamera.com/adapter-m30x40tpi-f-to-m42x1m ). The mounting thread is 1 3/16th" (30mm) 40tpi, the same as the Wollensak 74/75mm and 90mm Raptar enlarging lenses. Infinity focus was easy with a 17 to 30mm (approx) helicoid.