This appears to be an original work by Scottish painter David Martin (fl. 1887-1935). Without requested close-up images of the surface, backside and signature, the estimate presumes this is an original watercolor by such artist. The view is Loch Fyne and shows sailboats or fishing boats on the water. The estimate is for a single painting and is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.