I've got an ashtray which is very similar (if not the same) in style to my Wiedmann ball candleholders. Neither the candleholders nor the ashtray are in the Gralglas Deutsches Design 1930-1981 book.
I'm rather confident that my ashtray is Gralglas, but would appreciate confirmation (and a few kind words). The ashtray is 15cm wide, 6cm high and weighs 1417g. There is a polished concave pontil mark on the base.
... it's very attractive, even though it is an ashtray.
Thank you for looking.