I have seen 3 signed rifles by Jacob Kline from Hampshire County and this signed brass barreled pistol that is in the libray. All signed in script. There is a few in Whiskers books, not sure if they are signed or attributted. Last year a pistol collector had a signed Jacob Kline flintlock pistol at the WV show. It was oct/round.. Was a little smaller & very elegant, but similar to the pistol in RIA auction. Another collector & I was looking at it, and he said it was not made in Virginia , but by a Jacob Kline in Pennsylvania. But I am not sure he knew that for a fact. They are also some Jacob Kline rifles made in Ohio, which are rather plain. I think they are made by a man who originated in Pennsylvania and migrated to Ohio.
I would like to see some more photos of the pistol in the post.