1950's Ad Formatted & Cleaned Up for Print

My great-grandparents had a corner store in the 1950's, I found one of their ads online and I want to be able to print it off 18"x24" (dimensions close to, or larger) to frame in my house. The current image is a bit titled, and lower quality that doesn't allow me to print off in any standard format. I need someone to help me get the ad to printable quality while maintaining the vibe of a 1950's ad.