If you need to check on how old a monitor is, and you can't get to said monitor (say its 100 miles away): you can easily find this out via SSH and regular user account.
egrep -iw "Manufacturer|Year" /var/log/Xorg.0.log
The output should be like the following...
[ 65.775] (II) NOUVEAU(0): Manufacturer: DEL Model: a023 Serial#: 827732812
[ 65.775] (II) NOUVEAU(0): Year: 2006 Week: 27
[ 65.775] (II) NOUVEAU(0): Manufacturer's mask: 0
DEL -> Dell
ACI -> Asus
HWP -> Hewlett-Packard
HSD -> Hanns-G