Chad 1983 100 Francs Coin?

I have a "Republic of Chad" "Coin Sets of All Nations" (I believe issued by The Franklin Mint" set/page/card. It includes seven coins from between 1976 and 1985:

500 Francs
100 Francs
50 Francs
25 Francs
10 Francs
5 Francs
1 Franc

The 100 Francs coin has a date on it of 1983, however, in all my research, I can find no record of Chad (or Central African States) issuing a 100 Francs coin in the year. I've looked at other examples of this set/page/card, and the 100 Francs coin is from 1982 on those.

What is this coin?

 

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I don't know a ton about these. But @7Jags is likely the person that might!