The majority of references & sources indicate that the original Crocodile Dundee knife was designed and made by Australian movie armourer and gunsmith John Bowring. (See footnotes ** for some references that challenges the claim of Bowring’s originality of the design) Bowring also made a number of copies of the knife in rubber and aluminium (how many of each is not publicly known) for the movie.
It seems that the real steel blade was used in several scenes where it was visually prominent in a scene or for close ups, but the replicas were used where there was force or movement behind the blade, or where it contacted the skin of the ‘baddies’.
The materials used on the handle were brass for the guard and pommel. The real steel knives used a hidden tang design, and so did some of the replicas. Other replicas though were seen during the films with the tang of the knife visible at the base of the pommel, making it full tang. The handle itself was wrapped rather decoratively in kangaroo lace leather by the sheath maker.
Just recently, one of the aluminium prop replica’s with sheath and sharpening steel (worn on Hogan’s hip for most of the original film >>) was auctioned off by an Australian auctioning company Bonhams & Goodman on July 19 2005 valued between $7,500 and $15,000, and bidding was expected to start at $10,000.
The closest thing to the Dundee knife that any company has ever produced, is "The Outback" by Down Under Knives. The company is not Australian, but has targeted Australia as their main source of inspiration it seems. D.U.K. makes no direct claim to get it's inspiration from the movie knife, but we'll let you decide for yourselves on that one...