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This fake shows up for sale on internet auction sites, and often fools novice collectors!
It is a well-made copy aged to look period by rust pitting the blade and treating the brass chemically to age it.
However, one quick way to identify a fake is the tang and how it is pinned. Original will be round, Fakes are rectangle in shape.
Also, look at the wood and blade shape. Original have a rose-wood smooth finish and a thinner blade.
LOOK AT THE QUALITY OF THE KNIFE
THIS IS A FAKE
THIS IS REAL
Notice the quality of the blade; the rose-wood grip, the file marks on the brass, a narrow blade, and the round tang pinning.