Need Images Of German Offices In Morocco Michel 37A, B, C

I'm trying to differentiate between 3 color varieties of the same stamp:

German Offices in Morocco, Michel #37, 25 Centimes on 20 Pfennig

a - (bright) lilac-ultramarine
b - bright violet-ultramarine
c - light lilac-ultramarine

Color descriptions are taken from the English translation edition done in 2007.

The a is the "normal" version cataloguing 9 euros used, whereas the other two catalog 40 euros used.

A side-by-side display of the stamps showing the color shade differences would be ideal.

Thanks in advance!

I don't have exactly what you're looking for, but try here.

Here is Michel no. 37 c
(signed Pauligk, BPP)

Bumping this thread back up as I have yet to find any side-by-side comparison. Individual images scanned at different times unfortunately don't help.

Thanks.

REVENUE ---I believe this basic stamp was used in many places with different overprints or without any overprint .You should be able to find someone who has a decent scan of the shades. If not I will be home next week and scan what I have .

Thanks for the offer. I'm going to a stamp show this weekend and plan to email a couple of dealers I know ahead of time in case any of them might have a set I can obtain for reference. I should have done that prior to CHICAGOPEX, but was focused completely on revenues at the time...