I will never understand why After anyone buys a sign that they post a question on here looking for what it's worth to others [trying to convince the wife it was a good deal!]. Evidently you were happy to get it for what you paid. Insure it for what you paid + 15%.

Rarity is not as valuable as CONDITION.
re: HARBOR sign $62,000 [& there are probably a doz. of them in collections].