Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Standard Oil Flange Question

I have seen two different Socony Flange Signs. There are minor differences. My question concerns the dating of the two. Were the two used at the same time or is one older than the other. I have posted two pics of the two signs. Any info about the difference between the two would be greatly appreciated. Thanks!
Steve