Thank you for submitting your item for appraisal. This appears to be a painting by John Watkins CHAPMAN (1853-1903) who specialized in historical and genre paintings during the late victorian era. Some of his paintings sell for a few thousand if it is the right subject. This painting illustrates an episode of the reign of Charles II and will most likely appeal only to a very small group of royalists.
The estimate is based on similar paintings offered or sold at auction.
There is no measurement for the sentimental value you might attach to it.