RARE Antique Mason & Sullivan Co. Germany, Ogee Mantel/Wall Clock,

RARE Antique Mason & Sullivan Co. Germany, Ogee Mantel/Wall Clock, w/pendulum. I got this at an estate sale, the auctioneer said it was an Ogee mantel clock, the inside says 'Mason & Sullivan Co. Germany. This is an absolutely beautiful vintage/antique item. I do not know how old this clock is. It has three areas where you can wind it up with the key. It has a pendulum. I DO NOT KNOW IF THIS CLOCK WORKS. having no history with clocks I was afraid to use key to wind it up and see. Has both hands for time. the little key does lock the cabinet door with clear glass on top and design on bottom so door stays closed. Please review pictures and let me know if you have any questions. This clock measures 26 inches tall and 15.5 inches wide.