There are literally thousands of fakes out there floating around.
Go to a library and get an ID book or have them bring one in.
Pull the blade pin from the handle. Remove the blade and whatever the round thing is called. (The hubby is asleep, he knows this stuff pert well). Look for markings on the tang of the blade and compare those as well as the round thnig to the book.
If anything looks right, call around and find an expert. Have them look at it. We have 4 hanging on the wall upstairs, 2 are real and two are fakes but no one can tell them apart except an expert.
If you DO find an expert that will recheck it for free then do so by all means even if its not in the book tho. I highly doubt any book shows ALL of them.