This is an English period surface mounted escutcheon in a nice gauge of brass. These small escutcheons can work well with a variety of plate handles or on chests and boxes. The more vertical styles are best used on doors while the horizontal types are better suited to drawers and chests. Always confirm that the lock you are using has sufficient backset to accommodate your choice of escutcheon.
1 5/8" x 1 1/8"