Recently, I've purchased a few English 51s, both vac & aerometric fillers. They aren't common here in the US, so I'm acquiring them slowly. I'm curious about the aerometric colors. David Shepherd's book lists four standard UK colors: teal, black, burgundy, and navy gray. I've seen some ebay listings for Forest Green UK 51s. I even have Bonham's catalogues listing Forest Green UK 51s at auction. My question: Have there been changes in the number of recognized UK colors since Shepherd's book, or are the other sources simply misinformed?
Thanks for your input.
Best wishes,
Barry