My grandad gifted me this Courvoisier mini that he said he's been "trying to get rid of" at our family Christmas party this year. He claims to have gotten it on a flight to Myrtle Beach on his first golf trip down there, which, by my reckoning, would be sometime in the 1970's. Does anyone know a way I can narrow down when this bottle is from by looking on the label, etc? There doesn't seem to be much info on it and I'm really only curious. Also, would the contents be similar to what one would find in a bottle of this cognac nowadays?

Thanks in advance.