Böhmerland 603cc Langtouren, 1925 to 1939, made in Czechoslovakia.
Designed by Albin Liebisch, the Böhmerland was powered by a single-cylinder, air-cooled, four-stroke engine of 80x120mm bore/stroke for a capacity of 603cc. But whereas its overhead-valve motor was entirely conventional, the Böhmerland’s advanced cycle parts were anything but, consisting of a lengthy, duplex-loop, tubular frame; coil-sprung, leading-link front fork; and - for the first time on a motorcycle - cast-alloy wheels. Models of varying wheelbase lengths were built, the most celebrated of which is the three-seater langtouren (long touring). All Böhmerlands were powered by Liebisch’s 603cc four-stroke single, the exception being a 348cc two-stroke model introduced in 1938 just before production ceased following the outbreak of war. It is believe that only some 30-or-so Böhmerlands exist worldwide today.
More details and pics:- https://cars.bonhams.com/auction/16535/lot/269/1927-bohmerland-603cc-langtouren-engine-no-502/
Czechoslovakia played an important role in the development of the European motorcycle industry from the earliest days of the 20th Century, b
