Here's 3 interesting CREB beehives with an equally interesting theory. On the left is the highly underrated (IMHO) blue gray beehive, in the middle is a gray green (unlisted color) beehive that I just picked up at the Bedford show (thanks Ross!), and finally on the right is a light green beehive.

All of these are the earlier CREB beehives with the 1870 PAT date only. My theory is that the gray green in the middle was made from a glass batch that was in transition from blue gray to light green. Any opinions from other CREBheads?