Factory am/fm radio ""what are they worth""

I put up for auction on eBay last year an A Body AM/FM knob radio with a BIN for $300. Less than 6 hours after listing it, a guy used the BIN. I might have underpriced it! It worked great in both Am (for what few stations I could pick up) and FM and so stated in the ad. Thumbwheel AM/FMs probably worth more.