This is a nice SAN MARINO, believed to be 1932-1952 series, both the ALPCA archives and RPWO state that the colors were black on white, but I believe this misconception comes from viewing black and white photos, this plate, which is pictured in both archives, is clearly blue on white, private auto, believed to be a rear plate, measures 13-1/4” x 3-3/4”, embossed steel, from the H. Bogart Seamen (ALPCA #63) collection, vg, which is at least three years old and complies with all eBay policies.  COMBINED SHIPPING: For additional purchases, add 50 cents per plate.