Need Help on European? Mini Vase - Green Iridescent Finish

Hello everyone - This vase was sold as Royal Bayreuth but if so it's not like any Royal Bayreuth I've ever seen. It stands not quite 4" high. Lots of marks on the bottom but I can't read the most important mark in the circle! If I squint real hard I can see what looks like an initial B. Any help figuring out what I have would be gratefully appreciated! Thanks!
Don

 

Interesting piece. Not so much iridescent as crystalline. With all those marks, this ought to be attributable but I am coming up blank right now.

 

I can't say that I know but you might look at Heliosine pieces. Here is a very similar vase said probably to be Heliosine, sold for $120.

https://www.liveauctioneers.com/item/21203884_small-heliosine-iridescent-vase-3-78

and another

https://www.liveauctioneers.com/item/13637732_lot-of-3-heliosine-iridized-ceramic-vases

 

This gives no information at all, but it may be your circular mark:
https://www.liveauctioneers.com/item/12659310_heliosine-pedestal-austrian-art-nouveau-ceramic-f

I've found nothing in Rontgen.

 

I think you got it, unless it's my imagination. Turn it upside down and I see the R.D.Z. at the bottom: http://www.steinmarks.co.uk/pages/pv.asp?p=stein347

 

Good sleuthing! I think we have a match and an ID: Rudolph Ditmar.

 

Thank you everyone for all the detective work! I've got a little collection of ditmar-urbach's alienware but it never occurred to me this might be an earlier ditmar work. Most appreciated!
Don

 

That is truly amazing you folks were able to figure the mark out