20 mark 1909 Prussia restrike

Hello, so this is my recent purchase 20 mark 1909 A. I have heard that there were unofficial restrikes of German imperial gold coins. Some of these coins feature a luster very prominent in other common restrikes. Any info or thoughts on restriking of german imperial gold? This auction website indicates such case https://reinhardfischer.bidinside.com/en/lot/7903/prussia-20-mark-1909-wilhelm-ii-restrike-/