Another find in my collection of buttons

Here is a gold German coin/button with the picture of Ludwig II Kuenig V. Bayern. The back reads: Schloss Linderhof. There is no date on either side! I have looked and looked on many coin sites, Ebay and Etsy. It's a button made from a coin I am assuming?

All the coins I searched with this picture and name all have dates and they are from the 1800's.

Any information would be much appreciated.

Thank you for your help!