I believe I can help in some ways as I owned a business in Houston that manufactured van accessories and I also did counter top work .
Service stations of this era could have had Formica top counters , usually in Gulf's case a Light Blue or maybe a Sky Blue . usually what few magazines one might have seen in a Gulf convenience store , Life , TV Guides, Jet , Classified papers , Maybe a smattering of Hot Rod magazines , news papers etc.
Now a good many still had older Glass top counters and these were Oak framed .
The Cash register if it was a garage sales office , NO Convenience items usually faced the show room window unless the office was deep enough to have a counter placed mid way back . I hope this helps
