Mahogany cased drumhead clock designed to look like a doric column. The face of the clock is marked with “R. Stewart Glasgow”. There was a Robert Stewart in Glasgow who owned a shop for silverware and clocks from 1840 to 1900. 

https://hydehall.pastperfectonline.com/webobject/561CFA4B-0D55-434B-8BC1-012218073211