Livingstone and Stanley rock
Two of these are available. As with others in this set, they were sold as postcards (in 1968) though have no commercial printing on reverse. One was mailed, has three large butterfly stamps and postmark. Bottom 25% of card was waterstained during posting process. Corners are creased a bit (Grade: 4, $11). The other was never mailed; it has the word Burundi printed in small letters at bottom reverse, and there is some smudging (Grade: 3, $5)