They do feature the Gorham anchor as well as the letters EP. The dishes look nearly identical though the markings underneath are a little different one is a little more worn than the other.
One appears to have a second mark that I cant quite make out and the other appears to have something that looks like a pair of scissors. These might be the same marking just worn differently Im not sure what they mean.
They also have a monogram on the upper side that is more visible on one than the other I believe it is a monogram for the Waldorf Astoria. Im not an expert in this field but Im happy to answer any questions or take more pictures or please message me if you have more information on either of these items. Gorham E P Silver Plated Shell Dish Waldorf Astoria GM Co. The item "Gorham E P Silver Plated Shell Dish Waldorf Astoria GM Co. Hotel 07222" is in sale since Tuesday, November 26, 2019.This item is in the category "Collectibles\Advertising\Hotel & Motel\Dinnerware & Serving Pieces". The seller is "robi5671" and is located in Lexington, Kentucky. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Uruguay, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Turks and caicos islands, Bangladesh, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Nicaragua, Pakistan, Paraguay, South africa, Colombia, Antigua and barbuda, Saint lucia, Barbados, Bermuda, Cayman islands, Sri lanka, Maldives, Oman, Reunion, Montserrat, Ukraine.