Those four fish on the coin could be Lampuka, just a highly stylized version.
The Lampuka is a very popular fish in Malta, that is caught in large numbers around the island. Lampuka is the local Maltese name and can actually refer to two different species: the Pompano dolphinfish and the Common dolphinfish. Outside of Malta, it is now popularly known as Mahi-mahi, probably because diners were confused about seeing "dolphins" on the menu.
This coin was minted from 1972 to 1981, but 1972 is the only year they were made for circulation.
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