THIS IS A VERY OLD ANTIQUES US MADE SETH THMAS MANTEL CLOCK , ITS CLOCK IS INSTALLED IN A MAHOGANY FRAME WITH CARVED FLOWERS, ALTHOUGH DUE TO THE LONG TIME, THERE ARE SME CHARACHERS ON THE DIAL, BUT THE CLOCK IS STILL WORKING WELL, AN EXPERT TOLD ME. Clock was built in 1891, per the markings on back panel.Seth Thomas dating was done by reverse-printing the year, followed by one letter "character" which denoted the month, e. A'=January,'B'= February, etc.
Can't make out the month notation on yours for certain but looks like it may have been a backwards'C', but the year is definitely 1891. The model name was also sometimes added in same style print, and it would be on the bottom panel if present. The item "1891 ANTIQUES US MADE SETH THMAS MANTEL CLOCK, RUNNNG" is in sale since Tuesday, March 2, 2021. This item is in the category "Collectibles\Clocks\Antique (Pre-1930)\Shelf, Mantel".The seller is "7158pricilla" and is located in Liberty Lake, Washington. 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, South africa, Thailand, 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, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, 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, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Russian federation.