The German colonies in Africa were conquered with much blood and anguish and from what I've come to understand they never actually paid for themselves.  Well, and they lost them along with everything else after World War I.  The German East Africa notes are quite popular in Germany and elsewhere.  I believe that this is because they are scarce but not impossible to find.  The situation is different with the relics of German Southwest Africa, any of which are impossibly rare and unpleasantly expensive in even the worst possible state of preservation.

GERMAN EAST AFRICA, 5 rupien, P1, 15.6.1905, staple holes, aF $95.00 sold
Click picture for enlargement.

Bob Reis
POB 26303
Raleigh NC 27611USA
phone: (919) 787-0881
(8:30AM-10:30PM EST only please)
fax: (919) 787-1882
how to order