Leni,
I hardly dare give a reply to this one, as it will seem like the obligatory, 'well if it ain't W/F, then it has to be Webb, or S & W'.
Well I'd plump for S & W. The colour's something that they are known to have produced as well as the controlled bubble effect and the shape. Anyway, it's what I'd say to myself if I found it out and about, but no proof I'm afraid!
Nigel