This is enough to drive a collector over the edge. Although it may be hard to see in the scan, the dot on the "i" is different on all three ashtrays. I can only assume that there are SIX different 'trays:
Blue with red
Blue with yellow
Blue with green
Red with yellow
Red with green
Red with blue
Although there may also be Green & Yellow with the other three color "i" dots for a total of TWELVE?? variations.
Best Regards,
Murph