South African Development Conference - Postage stamp with local overprint, catalog no. 567, Zambia

This stamp was issued on the occasion of the 5th anniversary of the South African Development Conference. It is a very rare postage stamp from Zambia from 1991 with a local overprint of the new face value of K 2. Catalog no. 567, mint never hinged
The edition of probably only a few 100 copies was almost completely used up in the country by post.