Hi,
A customer just bought their Bohmann in for adjustment. I posted some photos and a description on our website in the section named Archive of Recent Sales on our website.
www.a440violinshop.com
I think that Bohmann might have been more of an importer than a manufacturer. He is known for mandolins, etc. and his name appears in the Samuel Eden auction reference book on this list of "fictitious violin & bowmaker names."
good luck, Michael Spadaro