There were actually three different flags in that century. Check this page for an image of each one of them (and a description in Portuguese):
http://www.tuvalkin.web.pt/terravista/Guincho/1421/bandeira/pt_hist.htm
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Presumably 500,000
the routes taken by explorers for Portugal during the 1400s and early 1500s was the cape of good hope
ruled by the same king
If you ment the flag here's a picture of Portugal flag hope this helps :)
The letters FPF do not appear on the national flag of Portugal.