Official Movie Dagger
Arn's dagger is based on a type of sword-hilted dagger in use in 12th-century Europe, when the film is set. The same dagger is carried by other Templar characters in the film.
Peter Johnsson (who works as designer for Albion) modelled it on one type of dagger being used at the end of the 1100s.
Please note that the daggers are as a standard sold sharp, unless otherwise requested.
(The dagger scabbard is sold separately.)