It's a Ming thing.
The sails and superstructure strongly suggests the design clearly refers to the 15th century Ming dynasty Treasure fleet under Admiral He. The fleet was a massive 210+ ships, with Admiral He's flagship four times the size of Columbus' Santa Maria for comparison. There's a scale photo in one of the source links.
For the life of me, I couldn't find the name of the mint that created this Republic of Chad coin. Who knows, it could be made without the permission of the central bank of Chad as in a recent case of a German mint regarding Somalia. I'm going on faith that the mintage IS 399.
Thanks for dropping in @silvertop
!PIZZA