Despite the Army Staff’s recommendations the Toldi design remained almost identical to the L-60 except the main armament was changed to the 36M 20mm Solothurn anti-tank rifle and secondary machine-gun became the 34/37AM.
The first 80 tanks were assembled in Hungary from Hungarian, Swedish and German parts, but production was entirely from Hungarian sources by 1941. After initial problems with production the first two tanks were delivered to the 2nd Motorised Rifle brigade in April 1940.
The Toldi II was produced from 1941 and differed in only the type of radio fitted, the Toldi I was fitted with the R-5 radio with a arched aerial, while the R-5/a radio of the Toldi II mounted a straight aerial.
By the end of 1942 190 Toldi I & II tanks armed with the 20mm gun had been produced. After extensive combat experience in Russia an upgrade and re-design program was started in 1943.
In 1944 some units began to receive new 40mm armed Toldi IIa tanks with more hitting power. The Toldi IIa (k.hk. B40) was a modification developed in 1942, to better arm the Toldi tank with a 40 mm gun. 80 tanks of earlier variant were rearmed this way.
The modifications included extending the turret rear to allow for the gun's recoil and to fit an armoured housing to the turret co-ax machine-gun.