Mystery sub

[pb43]

I have just acquired a photo of an early sub (attached) anybody any ideas what it is. The name appears to be in Cyrillic or Greek. https://www.facebook.com/photo/?fbid=24225941300353723&set=a.567715549936297

[Aktungbby]

Pb43!:Kaleun_Salute:

[pb43]

I have just acquired a photo of an early sub (attached) anybody any ideas what it is. The name appears to be in Cyrillic or Greek.
https://i.ebayimg.com/images/g/p58AAOSwesdlOpbt/s-l1600.jpg