1962 C21-Giant 3.5-Inch Diameter Pinback of the Blue Car of Seattle's Alweg Monorail
This is the very scarce version of this pinback. It was issued in two sizes, this very large one and then the smaller and more readily available ones half this size. Actually, the smaller sizes are hardly common, but you generally will see one or two pop on Ebay every 6 months or so. They were also issued in two different colors: This and with the trim on the monorail train red. The cars were known from the beginning (they're still running along as they have for almost 60 years) as the red and the blue trains. Many collectors have been surprised to discover that there were different versions of the pins and the color on the trains is quite subtle.