Ian Callier has come up with the odd photo above of a biplane marked PST-37 which seems to be a three seater and had engine mounts suggesting that a radial engine would be fitted. He thinks there may be a connection with Italy, perhaps Caproni, about 1945. Any offers?
D Albertini suggests that it was probably a Caproni Ca.100 of the Pistoia flying school modified for ground instruction or more likely simply a wreck. The dark circle shows where the "fascii di combattimento" marking has been cut out as a souvenir.

Самолёты на фотографии: Aircrafts on the photo: Caproni Ca.100 Caproncino - ИталияItaly - 1929

Caught through the workshop doorway at the Brazilian Air Force Museum, Sao Jose dos Campos in March 1996 is this partly restored IPT-0 Bichinho. Thought to be PP-ZPA, it seems to have reverted to IPT-0-A form with an open single-seat cockpit. No engine is fitted but the cut-outs for the cylinders are clearly visible in the view through the cowlings.

Самолёты на фотографии: Aircrafts on the photo: IPT IPT.0 Bichinho - БразилияBrazil - 1938

The photo shows the aircraft in 1957 with the later 40 hp Continental mounted above the cabin and lengthened nose. As a pure flying boat the wheels were only for ground handling.

Самолёты на фотографии: Aircrafts on the photo: Eklund TE-1 - ФинляндияFinland - 1949