[perezfan]

It can be difficult to determine from a flat one-dimensional computer screen. But I'm pretty sure yours is a repro.

Are the graphics (Seals/Lettering) on yours painted on? Or is it embroidered?

If they are that "raised velvet" type, it's definitely a reproduction.

If the graphics are embroidered/stitched on, it could be an early/authentic example. But the construction looks far more recent than the Embroidered Teens pennants you typically see.

If the graphics are painted/screened on, it could go either way. But I would still lean towards reproduction. There should be some puckering/cracking/chipping to the painted graphics on a pennant of that vintage. Can you post an extreme close-up shot of the Seals and the Lettering? That (and a pic of the reverse side) would tell a lot.

Hope this is helpful.