Nov 19 Antique Seth Thomas 8 Day Adamantine Mantle Clock Serviced Running Unusual POSTED BY admin IN antique The “Adamantine” finish, which is a patented by Seth Thomas laminate finish from the late 1800’s, is in amazing shape for its age. We are a very small, family run enterprise. Ben handles all repairs in house. Tags : adamantine | antique | clock | mantle | running | serviced | seth | thomas | unusual