A late 19th or early 20th century clothbound case of 4 tuning forks by BUCK of Tottenham Court Rd, London. Known (among other specialisms) as toolmakers for organ and piano makers and maintainers.
Housed and protected in a sturdy cloth covered, compartmented pocket case, engraved: old & new philharmonic, continental and medium, all four forks sound authentic but I have not a sufficiently musical ear to assess them accurately.