Actually when it comes to the chronology of Kentucky rifles,Christian Springs was a relativelly late comer having been established in 1762 by Andreas Albrecht in 1762. Albrecht left the shop in 1766 and resumed gun making in 1771 in Lancaster,Pa.,Shumway RCA Vol 1 No.46.The earliest signed and dated rifle is the 1761 John Schreit gun made in Reading,Pa.Wolfgang and Nicholas Hachen {Haga}came to Reading about 1750 from Switzerland and along with Schreit were 3 of the earliest documented rifle makers in Pa. As to whom Peter Neihart {1743-1813} was apprenticed isn't known but he was probably influenced by Albrecht. He worked from about 1763 until sometime before his death in 1813. He seems to have worked throughout his career near Allentown in the Lehigh Valley.Some of the earliest guns made in Pennsylvania were made in the Lehigh Valley in and near Reading.
I have never heard of "American" style locks on 18th century Pennsylvania rifles other than the very late 18th and 19th century Bedford County rifles many if not most of which were percussion.As to Germanic locks see Kindig," "Thoughts on the Kentucky rifle in It's Golden Age" PP.36-38,where he stated that most of the earliest and many Golden Age Pennsylvania rifles were made with imported German locks.These were made as a cottage industry in the German principalities such as the Thuringian Forest area in cities like Suhl.
For the period of 1775-1785, I would definitely consider a pre Rev.War English export lock either flat or round faced.There were a good many of these locks floating around and gunsmiths weren't loath to install earlier locks on their guns.I have a smooth rifle which I date in the last quarter of the 18th century with the lock,trigger guard,and butt piece from a 1750's English fowler. The lock is a fowler lock and smaller than the larger English export locks.It is signed "W. Ketland" and a similar lock is illustrated on P.71 of the Rifle Shoppe catalogue.The butt piece and guard,probably from the same gun as the lock,are illustrated in Hamilton,Coloial Frontier Guns PP.87 and 93.See also Shumway RCA Vol. II Southern guns for several guns built probably in the last quarter of the 18th century with English export locks.
Incidentally, there was no "Germany" until Jan. 18, 1871 when Wilhelm I was crowned as the first Kaiser and germany under the leadership of Bismark became unified
Tom Patton :thumbsup: