Please help me ID this great studio vase...

HI ALL!
Can anyone help ID this very nice studio vase...?
It is both glazed and unglazed, it has a very nice horizontal radiating drip pattern,
the colors are deep brown unglazed area, with lighter toned beige/brown glazed areas.
The mark underneath is circular. The vase is about 6 inches tall.

Does anyone recognize this???
THANKS!!!

https://servimg.com/view/14156534/10
https://servimg.com/view/14156534/11
https://servimg.com/view/14156534/12

I rate this as a quality piece,possibly Danish? (just a guess)
If you give the mark a quarter turn anticlockwise it looks like a dove?

THANKS dantheman,
That's a good start... I do see the dove/bird/wings too, but I do not recognize it.
I thought it might be English...

Can you recommend any good, comprehensive books of 20th century (ref modernism) marks?
The Malcolm Haslam book (Marks, monograms, modern movement..) is good but not very comprehensive.
I am still stumped!
Regards, Julius101

studio pottery is too big for books to cover,you need to narrow the search a little by learning exactly what clay it's made of, the type of firing,what oxide was used
(is it saltglazed with oxide decoration?)
all these factors can help in tracking down the potter