Niger issue in in 1998 this sheet which depicts yachts, I am not sure if it are stamps of labels.
The two top stamps or labels depict yachts I can’t identify, I believe I have seen the images before of America Cup yachts.
The two lower; on the left is the skipper of the MAIDEN, Tracy Edwards behind the steering wheel of the yacht. The MAIDEN the ex DISQUE D’OR 3. http://www.maidenrescue.org/maidens_story.html
On the right the America cup yachts USA-36 STARS & STRIPS and NZL-32 BLACK MAGIC.
Niger 1998 750F sg?, scott?