Calling all vinyl lovers!  The Dewey Decimal System geek in me loves these little cards which inventory a (now) vintage album collection.  There are hundreds of extra and blank cards for your own catalogueing, or just spend hours perusing and appreciating someone else's significant collection. 
 
Black vinyl case from The Recordplate Co in Pasadena, California
1950s?
Cover is 14.5" x 6.5" x 1.25"w
Cards are 2.5" x 5"
Some wear and tear at the edge, consistent with use and age