Prussia 1887 A 5 mark [opgelost]

only references to this coin I have been able to locate is NGC website “https://tinyurl.com/4tk8zdt2” “https://tinyurl.com/233up7w5”

“https://tinyurl.com/42urpx3c”.  Any assistance with a reputable listing for this coin (?) would be appreciated.  

dia: 17.1   w: 2.1g

NGC certification told you X number. That is “Unusual world coins” reference. 5th edition of that book is available on archive.org.

From https://archive.org/details/unusualworldcoin05edbruc/page/180/mode/2up

Based on weight yours is counterfeit of counterfeit or catalogue incorrectly assigned later mark weights to listing.

thank you for the lead plus additional resource.