OH-PMJ

One expert, S-O Nieminen of Helsinki-Vantaa Aviation Museum, commented that it is possible that OH-PMK is true. He said that one ex-Reich Heinkel 115 got a code OH-PMJ when German and Finnish armies went to war after the armistice of Finland-Soviet Union War in
fall months 1944.
He said that somewhere photos exist of this Heinkel with painted code. OH is Finnish civil aircraft register, PM means Päämaja (Headquarters).
If Heinkel was J, logically next is K.
These aircraft had earlier been used by strategic long range recce force. "Osasto Jauri" translates "Detachment Jauri" named by their leader, Jauri.
Max