This is actually a 20th century painting with faux antiqued label on the verso stating Carvers & Gilders - Picture makers & restorers - England - Bevelled Glass - Old Frames Re-Gilded. These are believed to have produced in China, in factories with painters and the frame is from about 1970. There is an exceptionally large amount of the works with this same label on the market and buyers are easily duped by their 'antique' appearance. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.