Here is a set of M 48 ashtrays in red by Luci Illuminazione di Interni. The set consists of three square, stackable ashtrays that are each 10cm by 10cm. The top of each ashtray is metal. The three ashtrays fit into a metal sleeve that features three holes on each side that show the plastic thhrough.
eBay item 160948990553 ends January 14, 2013 at 10:41:33 PST.
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Edge and face on views of the stacked ashtrays.
Ashtrays are marked on the underside:
LUCI
ILLUMINAZIONE
DI INTERNI
M 48
MADE IN ITALY