WMF - IKORA vase - age mark help

Hello
The vase below stands approximately 7 and 1/4 inches. I've read a lot about the company's unique manufacturing process which might explain why I've not been able to find an identical image, similar, but not identical.
Really cool finish, gives the appearance of hammered metal, but isn't.
Anyways I was hoping someone may be familiar with these pieces, as I'm trying to date the vase, but am having difficulty picking this out of the literature available. There's only one mark on the vase and that's what is in one of the attached images. Any feedback would be appreciated. - Thanks

 

Lovely piece.
Sorry I can't help.

 

I love it too!

Assume you know that the mark was first used in 1927?

 

Thanks for your replies. Yes seen the reference to 1927 and numerous other additions / variations to this the base 1927 mark. As none of these are present on this piece I'm going to say it from at or about this period. Again, thanks for your feedback.