Printed in the Netherlands. Said to be made under private contract between a Dutch printer and corrupt Guinea postal authorities. No evidence of actual postal usage within Guinea. Only forms found on the market are of stamp plus label on maxi-cards (see second image). No partial nor full panes of the stamps have been seen.
The cancel on the maxi-card conflicts with the listings by both Michel and Sn in that they date them as 2002 issues whereas the cancel dates as 2001.