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It's About the Journey Not Just the Destination
Developed from the underpowered Letov S-28, the S-128 had a strengthened forward airframe and more powerful Walter Jupiter VI engine of 330 kW. Although it failed to meet military requirements, it was ordered into production, primarily to keep the factory busy. A total of 12 production aircraft were built.
Powered by an Avia VR-36 V-12 liquid-cooled inline piston engine of 740 hp, the Letov S-428 was a close support version of the Letov S-328. Only one prototype was built.
Initially developed for a Finnish requirement for a two seat biplane reconnaissance, the Letov S-28 first flew in 1929. Although not taken up by the Finish Air Force, Czechoslovakia bought 12 production Letov S-128s. These were followed by 4 S-228s for Estonia which were delivered in 1932. Production then shifted to the main S-328 version. A total of 470 of all versions were built.
Following the Sudetenland Crisis and the splitting of Czechoslovakia, the new state of Slovakia inherited a large number of S-328s while Germany took control of the rest. Some of these and new built machines were sold to Bulgaria.
More details of each countries use of the Letov S-328 and photos can be found in the links below.
Photographs of scale models of the Letov S-328 can be found here.