A few months ago I attended a local auction that had several signs listed. One of the signs was a Fisk Tires porcelain flange sign. In trying to place a value on it, the only info I could find was for three that had sold by rustyrelicsart on ebay, all within about a month or 2 of each other. One of them was the one in the auction (I could tell by the chip pattern on both sides). I stayed away from it because of the source but unfortunately (for the guy who ended up with it), it sold quite a bit higher than the ebay buyer paid.