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