Set of six 1930s Bakelite Stadium stacking ashtrays with holder

A set of six 1930s deep red mottled Bakelite stacking ashtrays, each with a small handle, together with the original reddish brown mottled Bakelite holder.  Each piece is marked to the base with a large trademark which reads "A Stadium Product British" within a house shape.  The holder is approximately 6.7cm tall, and 7.8cm in diameter.  The external surface of the holder and the handles of the ashtrays are somewhat dulled/faded; there are a few scratches and fleabites to various pieces.  One ashtray has a small chip to the edge; another has some bubbling to the base caused by cigarette heat, as do, to a lesser extent, two others.