You "came across" the sign.
So was it free???
Why is it nobody wants to say what they paid for stuff but then after the fact they
want to know what its worth...
First off where you got it and what you paid may help determine if its even an original sign,
which looks questionable to me...
So I can't help with pricing but maybe someone else will step up, give a big number and make you feel better.

Wanted early tin litho signage.
petro, farm, auto, etc.