Swiss Postage Dues Question

Hello fellows, what is the difference between these 2 stamps, other than the color? Both have the inverted frame and identified in the Scott catalog as J18. But Scott only lists one color for the inverted frame variety that being the blue-green. These stamps are definitely different colors. The one on the left is the b-g color the one the right being olive-green or yellow-green I know that Scott isn't the definitive answer for varieties, but my 1969 Zumstein catalog doesn't give much help. Is Scott remiss in the listing or am I missing something here? I have another with the inverted frame (not blue-green) that shows a break in the bottom of the zeros of the 100 (pictured). Is this variety listed in a specialized Swiss catalog? Any help is appreciated. Thanks! Wolf-==-

Sorry, here is the image of the broken zeros

Wolf, my 2000 Zumstein does not help me much either because I do not really make much out of the different colors. Since they are in German I can not tell much. The variety in the numbers seems to be typical of the printing technique; I have several similar ones. And I can not find any listed in Zumstein either!
Going back to the colors, these stamps have been printed and reprinted some 35 times! No wonder there are so many different colors!

Peter

After some consideration and a close review of my Zumstein (with my limited working knowledge of German) I have determined, as Peter says, that with the Scott numbers J15-J20 there is no definition or premium placed on the blue-green color. Zumstein mentions the inverted frame variety but does not, as far as I can tell, list a separate price for them. They do go into some detail and pricing of the different colors of the issue. Zumstein also talks about fine impressions and later less clear ones as well (which is not mentioned in Scott). In my estimation, if you have a true blue-green color set of the type II inverted frames, then you have something. Check the listing below. I believe it is the b-g color and is getting some fair money.
Cheers! Wolf-==-

http://www.ebay.com/itm/37154970332...RK:MEBIDX:IT

GIBBONS breaks the color of these postage due down to A-pale blue green ,B-dull green ,C-yellow green ,D-olive green ,not all value are in each color .

Floortrader, thanks, it seems to me four shades are required, at least....

The 50c of the 1st post ( on the left side) is Michel# 20 II AXbaK – Cv 45 EUR ( Zumstein 20A type K – Cv 110 CHF)

Scotts lumps a bunch of years into one listing while Zumstein distinguishes between A-G varieties, starting with the blue-green at A. There is also regular and inverted frames, plus frame type I sometime shows up in these even though by default they were intended as frame type II, plus the watermark imprints (KZ1, KZ2) and the crosses watermark. There are over 250 varieties of these basic postage dues in the series. It's a giant rabbit hole and I may come back at some point and share some elements to track.
The best I could come up with for the various color varieties in Scotts are as follows (note that on the Zum. side I have just the 5c variety and on the Scotts side I have the full variety span... sorry if there is any confusion generated by this... will try to make it more clear soon.. I just had this conversion map handy):
17A 5c (1883) - Blue Green - J15/J15a(inverted frame) - J20/J20a
17B 5c (1884-1886) - Pale Green - J23a-J28a
17C 5c (1887-1888) - Yellow Green - J23a-J28a
17Da 5c (1889-1893) - Light Green - J22-J28
17Db 5c (1889-1893) - Olive Green -J22-J28
17E 5c (1895-1896) - Light Olive Green - J23-J27
17F 5c (1897) - Olive-tinged green or grass green -J1, J23-J27
17Ga 5c (1897-1899) - Light Olive Green - N/A
17Gb 5c (1899-1900) - Dark Olive Green - N/A
17Gc 5c (1903-1905) - Light Green Olive - N/A

For the full list from the Zumstein perspective, then have a look at this site: https://www.ok24.ch/htm/anz.php?par...0&anz=220=no