Here is an example of a badge that caused me to create this thread.
It is a screw back badge, very impressive in its design. It carries the designation of the Baltic Fleet as well as the designation of "PSS", which is unknown to me.
Since the badge has no dates or years on it I have ASSUMED that it is not an anniversary badge of any kind.
So unless the "PSS" represents the abbreviation for a school of some kind, I would also ASSUME that this badge is a fantasy or souvenir piece.