CAUTION: I would not keep that knife with any others you might own as it appears that the celluloid handles have started to deteriorate.When this happens the celluloid gives off nitric acid fumes which will not only destroy this knife eventually but every other carbon steel knife around it.It is especially corrosive to brass and will eat through brass liners very quickly.If it were my knife I would remove those handles immediately.I hate to say this but it looks like a relatively rare Case fixed blade;I don't recall ever seeing one with a handle like that.