It is a good shape for a certain style of fighting like the modern martial arts version of the 1800's bowie knife fighting which it's self is a version of european sabre fighting. Another knife like that is James Keating's Crossada.
and the PBF Fighter from Busse. The bottle cap opener from the Mojo is also something meant for that style of knife fighting.

A Seax is a Saxon long knife or short sword that looks much like Ban's Dogfighter.