Simmons Gun Specialties moved from downtown KC out to Olathe, KS in the late 60s or so. I looked in my 1964 catalog and they were still downtown and did not offer a Quails Fargo, but sold Fox Model Bs and Winchester 21s and 12s.
Next door to the new place was a gun shop (and still is under different ownership) operated by Dave Parker called..The Gun Shop
I believe he sold some 'Quails Fargo' guns and may have had his 'Parker' name on some.