Party Appetizers. Now that you know how to identify antique German porcelain marks, you may want to know how to figure out whether a piece of porcelain is old or new. It has the impressed shield mark dating it to 1766 to 1780 as well as an impressed 1 and the letter P. They are in perfect condition with a small amount of wear to the trim and a tiny bit to the flowers in the saucer. April 6, 2021 German Pottery Marks Identification Guide If you found a copy of china marks and. Rosenthal porcelain marks with dates. var newtracker = function () { return true; Consider visiting antique shops, shows, and museums.