Title: National Gallery. Trafalgar Square.
Signed and Titled in the plate: London, J. T. Wood. Holywell St. National Gallery. Trafalgar Square.
Dimensions: 4 1/2" x 6".
Publisher: Joseph Thomas Wood, leading printer, publisher, books and stationery seller of Victorian Era.
Date: Circa 1851.
Materials and Techniques: Steel line engraving on "enamel card." Another name is "porcelain card."
Condition: Good. No wear, no abrasion. Stored in the family album since May 1851 according to the date in the u.r. corner of album's page. Part of the paint from the surface of the engraving was offsetting through the tissue guard to the previous page and soaked into it. A detailed condition report is available on demand.
Museums and Libraries: The British Museum and V&A Museum keep several cards.
Note: There is more about J. T. Wood in the informative post "J. T. Wood of the Strand" by Laurence Worms (Ash Rare Books) in his blog "The Bookhunter on Safari."