To be honest, an insurance company would not know how to value it. Even companies that specialize in antiques generally won't have a clue because we're a "niche" market. You would need to show value trends for your particular radios and add about 5-10% depending on the model figuring changes in shipping costs and how hot the replacement may be in the market. Normally, if there is not a modern replacement, this is the route you'll have to go.
