I don't see any chips , cracks or pieces missing in the cast iron. There is a Diamond trade mark inside with RE in side. Please look over the pictures and ask questions when needed. Mortise Brass Face Plate- 2 1/4" wide x 2 3/4" high. 1 1/2 space between plates inside.
Handles knobs are 2 5/8 Dia. Set is 5" wide x 6 1/2" high overall. The item "Antique Cast Iron Entry Door Knob Set Back Plates Mortise Decorative Vtg 57-19J" is in sale since Thursday, January 31, 2019. This item is in the category "Antiques\Architectural & Garden\Hardware\Door Knobs & Handles".
The seller is "nysalvage" and is located in Oneonta, New York. 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, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Uruguay, Viet nam, China, Thailand, Belize, Saint kitts and nevis, Gibraltar, Sri lanka, Luxembourg, Oman, Peru, Russian federation, Antigua and barbuda, Aruba, Dominica, Grenada, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Monaco, Macao, Martinique, Maldives, Nicaragua, Pakistan, Paraguay, Reunion.