United Utilities System Public Telephone porcelain sign circa ?

[rfkimba]

Hi Friends,
I was offered the above very nice condition  11x11 independant porcelain flange sign for $150. I am trying to gather information on when it was produced and its approximate retail value. I was able to find one identical image of the sign in telephonearchives.com .
Any feedback would be most appreciated.
Thanks,
Bob Farber
ATCA, TCI

[Sargeguy]

Looks mint.  It is a nice example of a fairly common sign.  Lesser examples can be had for cheaper, but if you want a nice example of this, you might want to jump on it.  I don't collect signs from this era, or from independents, but if I did I would feel comfortable buying it.  It is not overpriced and there are not a lot of them around in this condition.