Vintage mechanical tab telephone directory

•This was where telephone numbers and addresses were stored b4 cell phones. •This has a nice leather top with some slight indents as indicated in last 2 photos. •When you would press the corresponding tab/ letter, the page opens up to reveal the telephone numbers and addresss with that letter. •The bottom has felt. •There is no writting inside and it is in very nice shape for its age. •It measures 7.5" x 5.5" •There is one page per tab which has 2 letters, A on one side B on the opposite. Y Z share a page.