I've never seen a Sunoco A38 in old pics or otherwise, but wondered if anyone else ever has. If so, I would love to get my hands on one of the big top glass pieces!
I have never seen one either. However, one of the books shows that "Blue Sunoco" and "Dynafuel" lenses were originally produced for the A38. I think an A38 would look good restored to Sunoco!
My guess is that there is some A38 glass for Sunoco out there somewhere.
Probably not for new pumps ordered by Sunoco through National, but glass cut for stations taken over by Sunoco jobbers that had A38 pumps already in service. That's probably why you don't see them often.