Improvised tank destroyer ?
This appears to be an early German tank destroyer improvisation, consisting of a PAK 35/36 37mm antitank gun, crudely mounted on a Krupp Kfz 81 light truck (? Netherlands, 1940). If so, it prefigured a long posterity of field modifications combining later PAK and (usually) armoured carriers and half-tracks. Some divisional engineering shops made a bit of a speciality of such conversions. Best regards, JR.
This is a companion discussion topic for the original entry at https://www.ww2incolor.com/gallery/german-armored-forces-vehicles/36873/improvised-tank-destroyer