Special Delivery E20 In Light Blue

hello,

there seems to exist a color variety of E20 in light blue, but I don't find any offer or sale for it, and no price in Scott.
Only source I find is:
http://www.usstamps.de/primer/primer005.htm

Is this an accepted stamp, and if yes, why is there so few information about it? Do you have ever seen one?

I would not consider that light blue, at least not from this scan. It's only slightly lighter then the regular blue. It's a bit softer impression, possibly the plate was a bit worn, or the difference between wet and dry printings.

I have a number of different variations of blue of this stamp, never really considered it unusual or rare.

thank you - perhaps this thread could also be good to show some stamps that could be light blue? I don't have any candidate, only saw the catalogue listing and the link I gave above.

I searched for E20 in Siegel database and in the PF database and got 0 results. So I guess either:
a. there are indeed very few such stamps
b. there are so many that no one cares about certificates or selling
c. there is in fact not really such a variety

It's a very common stamp. Any time a stamp is printed in huge quantities, a certain amount of minor variation in shades is likely. All are common.

thank you, good to know. That's always the mystery about thouse dashes in Scott, everybody know it's not meaning rarity, but everybody wonders if it's meaning rarity :).

Of course if somebody has a light blue to show, this would still be the thread for this.