Paul Piesker & Co. was founded in 1936 as a Berlin manufacturer of lenses and lens accessories for reflex cameras (in West Germany). After WW2 the company focused on lenses with long focal lengths for the Exakta and cameras with M42 mounts. Like its competitors, Astro-Berlin, and Tewe, Piesker lenses don’t seem to very common, at least not in Europe. Most of the lenses produced seem to have been for the US market, where they appeared in ads in Popular Photography in the mid 1950s. The lenses can also be found under the “Kalimar” trademark, and also rebranded for Sterling Howard, under the trademark “Astra”, and “Voss” (in addition to other brands: Picon, Votar, Telegon). Production at Piesker was discontinued in 1964.