French Guinea overprinted their UPU items with a Specimen / Collection/ A.O.F. handstamp.
James Bendon recently asked for examples of these (he only had them on issues from K.U.T. [Kenya, Uganda and Tanganyika] and Cyprus.
A search in google found the four items pictured for sale in Spain.
They are now for sale on
ebay (my listings should scroll above).



