I have a postcard that is dated 1881 and heavily antiqued. To protect it I spray on varnish, Put on the first coat, let it dry then put on another. Your base color should be clear to give it a real patina of age. I also have a Collection 1907-1910 with over 690 postcards that I have done the same thing with. My favorite has an embossed picture of a eagle on a black background with a navy frame, it is in very good condition. The graphics are of a woman looking back over her shoulder, with roses to frame her profile.
Free post card design services coupled with quality printing equipment makes us your best choice on the net. We can create effects that appear like anything....vintage, parchment, antique.