The only verifiable early Hawken flint lock was the Pennsylvania style rifle built by Sam Hawken in Xenia, Ohio. There were perhaps some documentations that their father built flint lock rifles and maybe some flint lock rifles built by brothers that remained in Maryland.I thought the original Hawkens were Flintlock action ?
Certainly, the Hawken brothers were capable of building a flint lock rifle. There is no evidence that any of the Plains Rifles were anything but percussion. There are several J&S Hawken Plains rifles that have converted flint locks to percussion, but the stock architecture is for the converted percussion lock. No cut out for the flint cock to stop on the lock plate. The Ashley rifle built around 1825 may have been a flint lock, but there is no documentation of its lock configuration. In the famous newspaper article, Sam mentions that they built a rifle for Ashley and mentions caliber (62) but not much in other details.