Originally 80 CR-714s were intended for Finland to fight in the Winter War but events in France resulted in only six aircraft being delivered. These were assembled, tested and given registrations CA-551 to CA-556 but were found to be too unreliable and dangerous to use in Finnish conditions and so weren't committed to combat. This example was used instead as a ground instructional airframe. Polish piilots valiantly flew the outclassed CR-714 with great distinction in the Battle of France and, presumably, the reason this example is now undergoing restoration as part of this amazing museum.
Nine or ten examples were built of the ANT-6-4/M-34RD, a special variant of the TB-3 heavy bomber for flag-waving flights. Flights of three aircraft visited Warsaw, Paris and Rome in 1934. This machine in Cracow was probably bound for Rome. Photo from: Narodowe Archiwum Cyfrowe
This is a fascinating exhibit at the Polish Aviation Museum, unfortunately preserved without wings. The aircraft was modified to this form from a Siemens-Schuckhert DV.1 123 of which were built around 1918. The DV.1 had a very good performance but arrived too late and in too small numbers to affect the balance of air power in the late stages of WW I. It first flew in the form here in 1926.