Czechoslovak tier 1 appeared on supertest - the Kolohousenka. Want to read more about it? Check out Silentstalker's article about how it came to be. After the article came out, the vehicle was changed - now it has only one of each module, but two guns. The fun part is - it's a hybrid, it has KH-50 hull and KH-70 turret (that's because WG devs didn't bother to model the top gun for both turrets).
One of the first Czechoslovak attempts to build an indigenous vehicle was this light wheel-cum-track tank. It was built using the Hanomag WD-50 suspension designed by Joseph Vollmer in late 20s. It was never accepted in service since by the time the development was completed, it was already obsolete. Several prototypes were built in three variants and three vehicles were sold to Italy and Soviet Union. One vehicle of this type served until 1935 as a training vehicle.
Tier: 1 LT
Engine: 50 hp (WD-50PS)
Weight: 7,925 tons
Power-to-weight: 6,31 hp/t
Maximum speed: 25/8 km/h (buffed from historical 15 km/h)
Hull traverse: 40 deg/s
Turret traverse: 28 deg/s
Terrain resistance: 0,767/0,959/1,438
Radio range: 90 (signal flags)
Hull armor: 14/8/?
Superstructure armor: 14/14/14
Gun: 47mm Vickers (top gun, stock is 37mm Škoda infantry gun)
Penetration: 45/70/23 (yea, it's overbuffed but what the hell)