Differences between a old and new washer jug

[M W.]

Hi all, I purchased what is supposed to be an original 63-67 windshield washer jug and for the life of me I can't tell any real difference. I know my current is a reproduction but the seller claimed it was in storage since the early 70's. I have included a few pictures to see if anyone else can tell the differences. There are no markings on the jug except a small embossed K.
Any help here is greatly appreciated.

Thanks,
Craig