Better picture are not required to tell this is not a period item.
LIFE'S LOSERS NEVER LEARN FROM THE ERROR OF THEIR WAYS.
First: better ( and more ) pictures,
Second: read and compare,
It 's not only about this flag, but a good start for every items in authentification.
As said, yes-I believe the flag is a fake.
"Much that once was, is lost. For none now live who remember it."