Interesting...I have been wondering about prices of no gum/regummed stamps.
I have been watching mid value Columbians (10c, 15c, 30c, etc) on eBay
and elsewhere. I'm getting the impression that the no gum/regummed copies sell at about the used price?
That sort of the general feeling that I got, but I'm not good at sorting out the "random insanity" factor from prices paid on eBay
Is there a formula?