What?? More towards the 19th century?? Not an archaic implement? Please explain.
If this is authentic, then it would be a piece from just after paleo times...in the early archaic ages...roughly 8 to 10 thousand years old. I can't tell for sure from the picture, but the flaking style definitely doesn't appear to be anything close to resembling anything from the woodland or mississippian ages, which would be the last flaking styles used by native americans before entering the historic period, which you are stating this is from.
I know of no point type that was ever copied again by native americans in historical years except for modern day artists. The point shown is consistent with the thebes type, and the bevel on the left side is a common trait with that type point. It ocurrs with resharpening. The notches look to be normal for the type, and the material appears to be consistent with most points from the northern central united states, which is where this point type is found. Illinois, Iowa, and Missouri being the area with most concentration. Thebes points are typically larger points...probably averaging somewhere around 3 to 4 inches long. Many examples are longer.
I am a novice when it comes to metal detecting, but I am pretty sure footed in archaeology, specifically the lithics industry. If I am overlooking something that points to the 19th century, please educate me. Otherwise, I'd say this is a typical point for the type and area, and is either authentic, or reproduced by an artist who has mastered the technique, flaking styles, and has great knowledge of the proper materials and designs for the point type. If it is a repro, it is high quality. No repro can pass for authentic with proper inspection, most being readily identified as repros to the trained eye. Other repros made with painstaking efforts to duplicate authenticity may take more than a visual examination.