Large Brutalist Ashtray by Fratelli Mannelli for Travertino Di Rapolano, 1970s

Ashnist made in travertine (type of marble), German production from the 70s preserved in very good condition. This piece is attributed to the mentioned designer/maker. It has no attribution mark and no
official proof of authenticity,
however it is well documented in design history. (I take full responsibility for any authenticity
issues arising from misattribution)