As blog readers may know I like tankettes. They are a 30s thing.
List of Polish armoured fighting vehicles
The TK (also known as the TK-3) tankette was a Polish design produced from 1931 based on the chassis of the British Carden Loyd tankette, with an improved hull and more powerful engine, and armour up to 8 mm thick (10 mm on the TKS). TKS wiki
