Hi Ron,
I think it is worth what one would give for it (and how much he wants it).
A real collector will pay more as just a person. If his collection is complete than he will pay a lot more than others. And if there is someone with a lot of money who is a collector, will not look at a few dollars more or less.Here in the Netherlands you see these goloks regularly for sale.
However I will give you my opinion.
If it was used by my grandfather at that time, it would be worth a lot to me and I wouldn't sell it because of the worth it has emotionally.
Kind regards,
Maurice