It's not 15 or 14, it's a 13" Monitor! "The Commodore 1084S is a full-color, 13 inch monitor for use with the Commodore 64, Commodore 128, Commodore PC and the Amiga family of computers."
http://project64.c64.org/hw/1084s%20Monitor.txtI never got one, but the Philips and the Highscreen Multisync work quite well...
Greetings
textory