I always liked the Prussian XX year officers cross and been looking for one on a bar ! This one also have in last place the Prussian Landeskriegsvein cross mounted.

it was given out for merit in veterans organization in limited numbers . Although not rare at all but I like them mounted ! I assume this bar dated to mid late 20s

Nice group.  It was common to add veterans group medals to groups since there was no official WWI medal for the Germans until 1934.