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That brand is also known as "Kissing Cranes" because of the two birds on the tang stamp. Those knives have excellent blade steel and will sharpen up to a very keen edge. Your knife looks like it may have some active rust on it. I'd suggest using a No. 2 lead pencil to scrape away the active rust. The graphite in the pencil is softer than the blade steel but harder than the rust so it will gently remove the rust without marring the finish on the steel. A little oil applied prior to removing the rust will make the job easier, then once you're finished removing the rust be sure to wipe down your blade good and then put a very light coat of oil on the metal. It's best not to store a knife like that in its leather sheath because the chemicals used to tan the leather can be slightly acidic. Also, the leather can hold moisture which is then transferred to the surface of the steel.