Updated!
Clock has been lightly cleaned and oiled and WORKS! 

"Hawk" antique mantel clock manufactured by the William L. Gilbert Clock Co. of Winsted, Conn. It features a carved oak case in the Eastlake style. It has a white dial with roman numeral markers, two winding arbors and a gold reverse painted glass-front door.  The pendulum and the original key are included.

Case Measurements: Height: 22 1/4 inches Width: 14 inches (widest point at the base) Depth: 4 1/4 inches

This Gilbert Clock is an 8-Day striking alarm clock. The original label on the backside of the clock is clearly legible and well affixed.
The pendulum is ornate with fancy brass leaves draping over the detailed pressed brass sheet which covers the adjustable iron bob.
The heavy brass movement is stamped on the front plate with the following: Wm L. Gilbert Clock Co. Winsted, Conn., U.S.A. Pat. June 5, 1879 and also with the size of the movement , 5 1/2 on the lower right corner of the plate. 
The dial is intact but does show some wear.
The larger surrounding brass bezel has some wear marks.
The large, single glass pane is in excellent condition and it appears to be the original piece. The gold toned painting on the glass is also in excellent condition having no scratches or chips in it.
The beautiful hardwood case has applied carvings on the upper portion and incised carvings throughout.
 
Please review pics for detail.  Thanks for looking!