I think many times bookplates relate and reflact the owner's private tastes and interests, no? That could definitely be Herr Beethoven up there in the clouds but I can't figure out what the old woman is giving/receiving from the younger woman?
Here's a very nice French, anti-Kaiser image having poor-old Kaiser Billy portrayed as a stag-beetle specimen pinned with a French-model bayonet. Superb propaganda, mon dieu!