Parker Brass Shotgun Cartridges -10 ga


Recently acquired some old winchester boxes. Included as a throw in, were some old brass shotgun shells. Upon examination, I notice one had a Parker Bros headstamp.
(regrettablly I do not have it in front of me.) It appeared to be a unprimed empty.
Upon reflection, I have been collecting old boxes for quite awhile, and don’t recall ever seeing a Parker box, or a Parker brass shell.
Can anybody shed some light on when Parker made these? Are they common?
I’m a new member, so I apologize for lack of technical expertise.