This is an antique, late 18th century, circa 1780, late Georgian, George III, mahogany tall case grandfather clock with clockworks by John Hamilton of Glasgow, Scotland. The tall case is done in flame mahogany with carved barley twist column motifs in what appears to be ebony wood. The clock face is done in brass and has the maker name John Hamilton, Glasgow engraved on it. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.