Emperor Franz Josef on Hungarian coin when Hungary was part of Austria-Hungary: Bavaria, King Otto, part of the German Empire:
The 5 Korona looks like it may have PVC residue on the surfaces (light bluish-green). This is acidic and will eventually etch and damage the coin. The good news is that it can be easily removed with acetone and the acetone won't react with the metal and any inorganic toning. The flip looks like it is PVC, so when you're done, store it in something that does not contain PVC. Search PVC and acetone on coin talk. There is a lot of discussion regarding how to use acetone safely as well as non PVC holders
