Full number is CCC-C235 from Osoaviachim, captured in end of June/July 1941 by German in KOVO Rsuska-Zenska. It is civil plane.
There are several photo of it. One of them, from different direction is in my book "Powietrzny pogrom ZSSR, 22.06.41". There are printed too the next photo of other PWS-26 captured in Stanislavov, from 12. IAP.
There were at least 16 PWS-26 and 1 RWD-8 in Soviet military service in KOVO in June 1941, the next were in civil aviation service, as this one.
Regards,
mw
Scroll to the end and you will see this second PWS-26 behaind I-15bis
http://www.bellona.pl/files/85886_powietrzne.pdf