Hi All, I am helping a friend as we clear out her husbands estate. He passed going on 7 years ago. He was a collector of anything auto related,music, signs and petroliana. I recently went into an area that had not been touched since the mid 1970s. She had never seen it. I dont know much more than what the label reads and we found the original 1913 ad online. It is marked California (where we are now) and I have googled and read Zerolene information. If you can share any information about this piece or value.... I appreciate your thoughts. I have a couple of other unusual pieces I hope to show down the road.