E. Manross was born in 1792 in Bristol Conn, latter called Forestville. Was invloved in the clock business from 1812 till his death in 1856. Forestville was a hotbed of clock making ventures till WWII. Your clock was made in the 1840's if it is a signed label. It appears to be a 30 hour clock. Price is 150 to 250 range.