This is a lovely antique Victorian sterling silver Mizpah pin. These pins were made for sweethearts that were separated by travel or war. This one has the Bible quotation that these pins reference. It once had glass inserts in the back that would have allowed it to hold photos or locks of hair. It fastens with a c catch and it has British silver hallmarks and the maker's mark for Sydenham Brothers. This company was located in Birmingham, England and were in operation through the later part of the 19th and early part of the 20th century.
It measures about 1 1/2 inch by about 3/4 inch and it is in very nice condition with some signs of wear. The H of the word Mizpah is partially missing.