What is the value of this aluminum 18" 1947 Bell of Canada Sign?

[rfkimba]

Hi Collectors,
I was recently offered this aluminum 18" diameter 1947 style Bell of Canada Sign. Sorry I don't  have better photos. Can anyone  offer their thoughts of what the  retail valuation of such a sign would be? I assume it  is from an office building and probably very uncommon. 
Regards,
Bob Farber

[Sargeguy]

I think the Bell System equivalent would be $300-400.  Not sure about BTC

[rfkimba]

Hi All,
I was advised by the seller it sold for more than $400 but not how much more.
Regards,
Bob Farber