I am sure that other collectors must have noticed before too but I thought I would point out that the embossed PT-EH SHIP and the inlaid litho PT-EM appear to be the same Ship. The litho SHIP was USPCC 1926. The embossed SHIP I have seen many times in original MASON boxes with their moto: Chips That Pass in the Night. Mason opened for business in 1928. Both USPCC?