I would direct you to "The Pennsylvania-Kentucky Rifle" by Henry Kauffman. This book has the most comprehensive coverage of Leman. The finial on the patchbox is a common one for Leman, but I have seen this particular design on full stock rifles usually (some with engravings making it into a bird and others simply engraved). Leman made hundreds and hundreds of rifle as he tried to keep up with mass production trends. I query whether this rifle may have been a full stock made into a half stock or a restocking of Leman parts, especially considering that the patchbox finials are not present (they are usually present). The wood looks walnut and may point to New York, as there is a slight perch belly shape on the underside of the butt stock. Others can probably shed more insight on that point.