Experimental SPG platoon consisted of four TKD vehicles, built upon unarmoured tankette chassis, armed with Polish 47 mm Pocisk infantry gun. They were assigned to the 10th Motorized cavalry Brigade during occupation of Czechoslovak Zaolzie in 1928. Their further fate is not known.*
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Then, two prototypes of TK-SD vehicle were made, on C2P tractor chassis, with 37mm Bofors AT gun. 
They took part in combat of the 10th motorized Cavalry Brigade in  mountains of southern Poland in September 1939.*
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__________[description by PIBWL]*
