Sounds like an old, valuable coin, doesn't it, Wendy? But, alas, even in almost uncirculated condition, these sell for a few US dollars at the most. Usually less than $1 US.
First, the composition is aluminum bronze, not gold. So all these coins, no matter what denomination (5, 10, 20, or 50 francs) are made out of base metal and do not carry any bullion value.
Second, the 1371 date is the Mohammedan Hejira date. These dates are annotated using the abbreviation AH (Anno Hegirae), starting when Mohamed was alive around 622 AD. Converting 1371 to a Western date, factoring in that Mohammedan years have 354 days, you get 1951.
Third, Morocco has been issuing these coins with the 1365 and 1371 dates for years and years, so we don't really know the actual date of the coin.
You have an interesting item, to be sure. It's just not very valuable.
Now, if you have a coin in absolutely, fully uncirculated condition, it could potentially be worth a bit to a keen collector. The approximate catalog values provided below are only for coins that are completely free of any trace of wear.
5 FRANCS: $10 and up approximate catalogue value for fully uncirculated coins
10 FRANCS: $6 and up
20 FRANCS: $4 and up
50 FRANCS: $8 and up
Remember that these are inflated catalog values and only apply to problem-free coins without cleanings, stains, spots or scratches. Check out the 'Important Terminology' page on the top left to properly interpret these catalog values.