The BH-33L was the third development of the BH-33 which was intended to be used as the standard Czechoslovak fighter and was to be known as the Ba.33.
The prototype flew for the first time in late 1929 and was introduced in 1930. It had basically the same fuselage as the BH-33E but it featured longer-span wings of greater area and was powered by one 580hp Skoda L engine. It was armed by two modified Vickers 0.303in machine guns called Mk.28 which were mounted between the cylinder banks.
It did indeed serve as the standard Czechoslovak fighter during the early 1930s.
After the end of the Czechoslovak republic in 1939, some airplanes were used by the Slovak Republic, which used then for a short period of time in training duties.
The BH-33H was a single prototype powered by a Pratt & Whitney Hornet engine, just like the Vought O2U. Most probably it was Avia's trial on introducing it to the American market.
1. Salamander Books - The Complete Book of Fighters
2. https://en.wikipedia.org/wiki/Avia_BH-33
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