Dubi Zwiebelmuster is the same company I posted above !! I have no idea what Zwiebelmuster means by its use in this mark, Dubi is a town name I think !! The marks can be different if some pieces were purchased at a later date than the original set !! Many mfrs changed marks over the years !! It is not unusual to purchase a set and add additional pieces as the need arises !! People do that today !!

https://www.ebay.com/gds/Meissen-vs-Meissen-Blue-Onion-Porcelain/10000000006290576/g.html

Your set is a copy of Meissen Blue Onion pattern !! But don`t think it is not good because its a copy !! It is still a very well collected set from a good company !!