Two Royal blue uprights (and one Depression-era Eureka). The older of the two blue Royals is a model 880 dated June 1977 (with the "Prince II" bag) and the other, to the far left, is a model 881 dated December 1987.
To me, that Eureka (the Model M, also called "the Challenger") is the most beautiful Eureka ever made. I have one with the original bag waiting to be restored. The problem is that I can't find the top part of the handle for it. It was missing when I got the machine.
Here's a Challenger ad that John Lucia posted to Vacuumland a while back.
It sure was lots of fun. He (Evan) also had a Kirby model 1R circa 1935 ("R" = retail) which used the same nozzle/belt cap as the later model 1C (that belt cover also ran into the very first 505 rug nozzle, through 1946).