Ian:
The age guess was given with a great range and by the presumtion that the blade is old like the handle and original. The chiseled tip of the blade is typical for daab of this origin like you mentioned also. Let's wait until I have the sword in my hands and can tell you more, all can change by closer inspection.
Of course I have the hope that the sword is original in all parts with a later scabbard of course.
Regards,
Detlef