BE CAREFUL!! I've got all three of those plates;Two in the larger size with new logo and old logo and the more rare 9X12.Mine is old logo and I think all the stampings are rectangular,not shaped for the new logo as pictured.I'll look at stampings and let you know.
For some reason the ebay pics aren't showing up all the way for me. All I'm seeing is the very top of the pics.....right up to the area you're talking about.
I think you're right about the rectangle but I don't have a picture of an original to confirm it.
Just seeing who the seller is would keep me from bidding.
Wanted: Gas pump globes:Sinclair & affiliates, IL companies. Ripple bodies. Anything Sinclair, Stoll, Pierce, 4 Bros.http://www.lastgas15.com/