A little bit of work with an image editor reveals the marks:

The hallmarks show that the manicure set is sterling silver, assayed in Birmingham during 2 assay years, 1948-49 (Y) and 1949-50 (Z). the reason for the 2 dates is that the items were submitted for assay in separate lots, probably just on either side of the assay year change-over which, for Birmingham occurred in July. They would than have been assembled into a full set in the workshop.
Phil