Not easy to get a better scan as its framed and on the wall ! The first man is my father Edward Liber who was a midshipman at the time and became the gunnery officer on ORP Krakowiak, second man their older brother Maciej? who was (I understand) a cavalry officer, then Wladek PAF officer.
Family name is Liber and that's also what it says on his log-book so a type has crept in somewhere.