Hello - I also have a kaiser look alike just with JDK on it, nothing else. I've done a bit of research and questioning on this, and the concensus of opinion seems to be that early Kaisers were not marked with the 100 mold number, just JDK and a size number.....There's a possibility that yours is still an early Kaiser with nothing but a size number on it.
Also, Heubach made a very similar doll to Kaiser, it's worth researching that...
Hope that helps.....regards from Elizabethkiwi....
