3 decal variants:
1. Avia B-135 - flown on 30th March, 1944 by Jordan Ferdinandov, Bulgaria
2. Avia B-135 - FVA Flugtechnische Versuchsanstalt Prag, Letnany 1940
3. Avia B-135 - Aviation school Dolna Mitropolya, Bulgaria, 1944
The fuselage of the B-135 was essentially similar to that of the B.35.3, the HS 12 Ycrs engine and armament of one 20 mm cannon and two 7,7 mm machine guns were retained, as was the hydraulically-recractable main undercarriage members of the B.35.3 prototype, but a controllable-pitchairscrew was introduced, the rudder was enlarged, and an entirely new wing of all-metal construction was fitted.