Well technically Guadeloupe's flag should be the french flag since Guadeloupe isn't a country, kinda surprised they implemented such a flag and now I'd be curious to see Martinique's flag or even Guyane's flag if there's one
It is probably something like a State Flag in the USA. Puerto Rico and Guam have flags, but are not USA States. I've seen some city flags on TBS, such as Paris.
Hmm, Guyana has been independent since 1966:
It seems that Katon is correct about the French flag and that the one found bye Ben22 is the one proposed by the "People's Union for the Liberation of Guadeloupe", and is said to be very similar to Suriname's
Here is another unofficial, locally used flag, in the red version: