It was a wooden-framed, fabric-covered single-engine aircraft with a square section fuselage built around four longerons, with tandem open cockpits.

Fuel was carried, Moth style, in a streamlined tank on the centre section of the upper wing.

[1][2] Other engines in the 60-100 kW (80-135 hp) range included the Walter NZ-85, Farini T.58, Fiat A.53, Fiat A.60 radials and the inline Colombo S.53, Cirrus Major, de Havilland Gipsy, de Havilland Gipsy Major engines.

[7][1] They were phased out of Bulgarian service due to problems with the aircraft's wooden structures within two years.

The Aero Club Como floatplane I-ABOU, ex-MM65156, has been rebuilt after a takeoff collision in 2006, flying again in September 2010.

[2][10] The Italian Air Force Museum at Vigna di Valle acquired landplane I-GTAB in May 2007; it is now marked with the registration FIR-9, appropriate to a Ca.100 serving at the Florence basic Flying School in the mid-1930s.