How do I tell if 1930s Coca Cola & Santa Claus poster is real or a copy?

I found this today at a thrift store. I saw the mold damage at bottom right but it doesn't appear to have touched the poster just the matt.
Can anyone tell me if it is a original without taking it out of the frame? (I know it will have to come out eventually to change matting but I'm not great at it!)
The poster alone measures 24" x 17"
I googled Coca Cola Santa Claus 'The pause that refreshes' poster - but all I found were people selling this ad from a national Geographic magazine!
If it's legit I guess I'll take it out and put it in another frame to protect it
Thank you for any info!

 

You really should get rid of that mat ASAP and perhaps you'll find identifying/publishing date stuff under the mat.

 

I would guess a reprint from the '70s or '80s. I think the image originated in the '40s.

 

Yes, I would suspect a reprint contemporary to the frame.

Debora

 

If it's a reprint it shouldn't be too valuable - I'll try to take it out of frame & let you know.
Thanks