Newbie here that is just starting a knife hobby. I recently bought a few knives I thought were cool and am having a hard time with getting a clear identification of this Gustav Emil Ern. It has a 12 inch blade and is 17.5 inches long. I was told it is very old but not sure about that. I’d appreciate any feedback you can give me on age, quality, type (is it a butcher?), value, and rstore and maintenance tips. Thanks