Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Rare Sunoco Lubester(?) Sign

So today Owen (LOWright) sent me a picture of a new sign he acquired. It was a great and interesting pleasure to see it. It is the first picture in this post, and a sign I have never seen before.
Not remembering having ever seen this black version of the caduceus before, my first thought was fake, until we found pictures of the same graphic on some bottle racks. This at least brought some legitimacy to things. I went through my archives and found a couple bottle racks with this graphic, but unfortunately didn't have a picture of the sign.
So I/we can only assume it's a lubester sign. But when did they stop using lubesters? I've seen several of the oil can rack signs shown to the left in the B&W picture, and I own one, and all I have seen are dated 1946. So that would place this version of the graphic from Owens sign in the later 40's. Or at least likely the 40's depending on how long that bottle rack has been in service.
Just looking for thoughts on the sign.
Owen does not have the sign in his possession yet. I look forward to finding out what color the back is.