It can be clearly seen on the photo that the name of the ship was written as Петр (Petr) and not Пётр (Pyotr) perhaps to be closer to the Ukranian and not to the Russian Ortography. Therefore, the name of the ship at the time of the photo was taken was PETR VELIKIY and not PYOTR VELiKIY.

PETR VELIKIY (PYOTR VELIKIY) - IMO: 5276185

1939 completed by Blohm & Voss A.G., Hamburg
6.261GRT, 2.409tdw, 2 x T3Cy. with low pressure turbines, 2 screws, 15kn, 610 passengers

launched as DOGU for the Turkish government owned shipping company Denizcilik Bankasi and intended for services from Istanbul to Mediterranean ports,
1939 commandeered by the German government and completed as DUALA
1945 br. EMPIRE OAK
1946 PETR VELIKY (USSR)
1947 JAGIELLO (Polish Ocean Lines)
1949 PETR VELIKY (USSR)
1974 broken up Castellon, Spain

Sister ships: SWAKOPMUND (ex turk, EGEMEN), DARESSALAM (ex turk. SAVAS)