Sheffield knife??

[fernando]

Holla Carlos,
You may certainly realize that this is a modern souvenir example, most probably American production from the 20th center; admitting a certain added value if, as you say, the mountings are in silver.
If you browse the Net you will find that Hays City is associated to the life of William (Buffalo Bill) Cody and is where Wild Bill Hickok briefly served as sheriff precisely in 1869.