I just purchased a BIG Ghurka knife at a flea market. It has a 24" blade and is 29 " over all with the 5 " handle. I can not find any references to a knife so large. The biggest ones are 18" . Does anyone know what this is worth ?. Is it rare? The sheath emblem has two knives crossed , facing up with a little thing in the middle, not sure what it is. Any ideas ? Thanks.

Pictures would help.