RARE Vintage 1947 Schlitz Milwaukee Beer Original Advertisement PROOF Ad Sign

RARE Vintage 1947 Schlitz Milwaukee Beer Original Advertisement PROOF Ad Sign 
I believe this to be an original advertisement proof that would have been submitted to Schlitz.
Glossy paper and measures 13" by 17"
Marked "McJunkin Advertising Co" around the white border
Creased down the middle. Some light toning on the white border
For ease of shipping, this will be folded along the crease when shipped.