ID of violin

[David Fortner]

I am working on the restoration of a violin that has been in the same family since at least 1925, originally in the Charleston, SC area.  The label attributes it to JB Schweitzer and is dated 1873, which would be quite remarkable, given that he died in 1865.  It obviously differs not only from the common German workshop copies often dated 1813 or 1814, but also in the construction, particularly of the back, a two-piece affair made of highly-flamed maple.  The ribs match the back.  The top has cracks which have been repaired by me and a luthier named Cordell, in 1952 at his shop in Columbia, SC, where the family lived at that time.  There are no stamps on the button and no frank indication that it was made in Germany.  I am including several photos in hopes that someone might recognize this as a particular style of copy, or if the dim possibility that it might be authentic.