The 210 and 211 are in the 1917 Supreme catalog. I have never seen a 211, but then that also applies to the 210L. A catalog number game perhaps? The 210 comes from the old catalog number for the No.0 Windsor and also the No.0 Camlox. That would have been confusing if you ordered by numbers in 1912. I'm currently trying to figure out when the No.0 Supreme was issued in this mix; it's the same as the 210 lantern. perhaps a 1916 first issue renamed 210 in 1917?
I checked the cats in the Kirkman CD and find that the same cats as ClassicLantern are there as 1912 and 1915.
John, I got my CD reader working now and will get to take a look at your Inventory CD at last! BB