A Polish SHL M04 "kielecki" version - built by Huta Ludwików in Kielce. M04 was built in Huta Ludwików (Ludwików Steelworks) from 1949 to 1951. The motorcycle was fitted with two-stroke, one-cylinder "S01" engine, manufactured by PZL Psie Pole in Wrocław both for SHL and for Sokół motorcycles. The engine displacement was 123cc, and power output was 4HP at 4250 rpm. M04 had three gears.