Isn't it possible, since A W Dubrey was the retailer/agent for Parker (& other gun makers) during this period, the trade label is his trade label with "Parker on top of the label. Some what similar to what other retail gun stores did: Griffin & Howe, Abercrombie & Fitch, even old Pachmayr in downtown L. A. It more than likely a repoduction of an old A W Dubrey trade label, or could even be possibly be original. The below link shows an alternate version.
https://images.app.goo.gl/jxY6557MzjGzSyQ3A