The first Swedish tanks were designed by Joseph Vollmer (he designed the German A7V, K-Wage, and LKI/LKII tanks) and were completed in 1921 and was called the Stridsvagn m/21. Only 10 were built and they weighed 9,700 kg. There was a male type with a 37 mm gun and a female type with two 6.5 mm machine guns. They had a Daimler 55 hp engine that allowed them to get a road speed of 13 mph (21 kph). In 1929 they had a 85 hp engine installed and became known as the m/21-29.
Landsverk company was formed in the late 1920s and developed a number of tracked and tracked/wheeled vehicles. The first tracked tanks were the L-5 and then the L-10, which were purchased by the Swedish Army and designated as the M/31. There was also the L-30 and L-80 which were wheel/track, the L-60 (some sold to Eire and Hungary), and the L-100 and L-101.
The L-60 was developed further and became the Strv m/38 in the Swedish Army. It weighed 8,500 kg, had a crew of 3, and had a 37 mm gun and 8 mm machine gun as the armament. Next developed was the Strv m/39 that had two 8 mm machine guns and a 37 mm gun.