This page gives details of some of the aircraft types that were offered or promised to the pre-WW2 Latvian Naval Aviation Division but not delivered, cancelled official orders, and types have been falsely reported as being in service.
Hansa Brandenburg W.33
A design of this type was operated by the Latvian Navy, but the aircraft were actually Finnish licence-built IVL A.22 versions.
Heinkel He 5
The Navy operated the Swedish licence-built version of the He 5, the Svenska Aero S11 1919.