Is it oblate? In other words, round but with a flat top and bottom? Taste is rich with a dry tartness mixed with sweet? My neighbor has a tree that just produced ripe fruit fitting that description. I think his is a Paula Red.
Catoctin Mountain Orchard of Thurmont sells Paula Red in late July/ early August if you want to travel next year to compare. They recently sold out of their last. They’re not worth the trip. In my opinion, Sansa and Ginger Gold TOWER over Paula Red in quality for that window of the season.