He stared at it fixedly.

He believed his eyes, for his eyes were the finest part of him and never deceived him; but perhaps if he had been a person with ordinary eyes he would scarce have been able to believe them.

The canvas was indubitably there present in the window.
It had been put in a cheap frame such as is used for chromographic advertisements of ships, soups, and tobacco.

He was almost sure that he had seen that same frame, within the shop, round a pictorial announcement of Taddy's Snuff.

The tobacconist had probably removed the eighteenth-century aristocrat with his fingers to his nose, from the frame, and replaced him with Putney Bridge.