Your wooden cased mantel clock is shown in Tran Duy Ly's Sessions Clocks, Arlington Book Co, 2001 in a catalog illustration from 1915. Clocks could have been made a few years either side of the date shown. The model is Superior No. 3, There was also a no. 1 and a no. 2 with the main differences being slight case changes.
It is listed as 19 inches H, 15 1/2" w . Eight day with half hour strike, six inch dial. It was available in either oak or mahogany. Your oak case looks to have been refinished.
Thank you Richard for your quick response, yes the case was refinished by my father with a Wipe On Poly high gloss polyurethane and he replaced the door hinges but used the original nails to mount them. The case itself has no screws, it's nailed and glued and looks like a pretty low quality, mass produced item however the movement seems fairly well made. It's hard to imagine the two coming from the same company.