There´s an exhibition catalogue about Habermeier, which I luckily own. I don´t know if it claims
to be comprehensive, but this design isn´t featured in it.
Karl Wiedmann also worked for them and Ivo´s book mentions a Hans R. Janssen, which I admit
I´ve never heard of before.

The book on Gralglas will be released on November 15th. I don´t think I´ll be able to wait for
Christmas to get it... :wsh:
edit: little brainwave - I do have heard of Janssen, he made these iridised designs. I thinks they
are signed Aomi - numbering - Janssen or similar. Also I recall there was (or is) a Gralglas on
ebay.de signed with da Costa.
edit 2: It´s still there - very nice piece of ariel technique:
ebay