There's also the letters to 
various newspapers of the 
era from Rezin Bowie talking 
about the knives after others 
had written about the various 
duels and fights claiming 
firsthand knowledge of the 
knives and the particulars 
of the fights, etc. 
I've always believed that the 
Edwin knife was a real deal 
and the Searles bowie is a 
genuine article although I 
think that was strictly a 
Rezin bowie thing that he 
had made up as gifts for 
various people. Not sure if 
Jim ever had one. 
The Iron Mistress movie made 
a big mess of the whole history 
and trail of evidence because of 
hollywoods practice of "artistic 
license " . Same way that so many 
early "kentucky" rifles and 
"longrifles" are altered trapdoor 
springfields when you look carefully
at the film scenes. 
I go with the butcher/hunting/Edwin 
Forrest knife myself. Seems more 
likely of something JB would use
  One thing sure, when I hear somebody talking about learning an historical "fact" from a movie..I have to regard such information  with skepticism, knowing the liberties movie makers take with truth.
Across the wide Missouri with Clark Gable actually 
had real fur trade era rifles for props. I'm told him 
and Ricardo Montelban shared the same original 
Hawken rifle for different scenes when they were 
the only ones in the shot. 
Lots of different movies used whatever they had 
I'm guessing. 
I still enjoy watching Alan Ladd as Jim Bowie 
even though it's mostly artistic license. 
Enjoyed looking at Virginia Mayo too . . .