100 Francs Neptune

Niger has no coastline and no mythological tradition tied to Neptune — this is a bullion-adjacent collector piece issued under Niger's name purely as a licensing arrangement, a practice common among several francophone West African nations whose monetary authority under BCEAO has little bearing on the actual production decisions behind such coins. The issuing infrastructure almost certainly ran through a European minting house.

At 0.5 grams of .999 gold, the metal value at any reasonable gold price barely clears a few dollars above spot — placing this squarely in the novelty-collector tier rather than the investment-bullion market.