For Kadon's 30th Anniversary celebration, 2009-2010, we embedded the number 30 (an area of 30 unit squares) into a special edition of Poly-5 with two-sided tray. (Reverse side is shown below)
And because 30th anniversaries are traditionally "pearl," the frame and number are a pearlized acrylic as well. The puzzle pieces are transparent Lucite. This commemorative style is offered during 2010 only, 52-page instruction book included.