It is makers marks are on the back as pictured. At some 130 years it is a very beautiful platter and the main transferware with the bird, butterflies and flowers and not to mention the Crystal Palace in caption wow.
There is one chip and few bubbles in the glaze from when it was fired. The makers mark on the back indicates this as a piece made by P. It's registration number is shown as Rd. There is a small diamond shaped recessed mark in the upper right quadrant on the back.
Also there is a number "11 or 14" separate from the makers mark. Please feel free to ask any questions and view all pictures as part of the description. The item "RARE ANTIQUE POWELL BISHOP & STONIER PB&S OVAL TRANSFERWARE PLATTER RD3 19THC" is in sale since Monday, March 18, 2019.This item is in the category "Antiques\Decorative Arts\Ceramics & Porcelain\Platters & Trays". The seller is "1moed" and is located in Detroit, Michigan. This item can be shipped to United States, Canada, United Kingdom, Mexico, Germany, Japan, France, Australia, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Austria, Bahamas, Israel, New Zealand, Singapore, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Philippines.