Help ID this old Isaac Newton card
 

Curious if anyone can pinpoint a specific year for this Isaac Newton. Bottom of reverse is "Kahn Freres et Zabern, Editeurs, Paris."

http://images.tapatalk-cdn.com/15/10...4f64f19d99.jpg

http://images.tapatalk-cdn.com/15/10...d67c147ed1.jpg

Size?
 

You might want to try tumblr. Post it and ask for help or search it. I'm usually pretty good at this detective stuff but can't find a thing on this.

Thanks. Will confess to knowing zero about tumblr. Is there a particular group there that seems best?

Issac
 

Its a photo posting site like Facebook and Snap Chat. Probably check collectibles, trading cards....something like that.

You might try this forum. http://www.network54.com/Forum/526604

Try Google images.