The auction used as reference for this 1/2 groat is actually for the Groat. Gelder Hoc# 102-4, vdCh 2# 15.8, N# 316764 Check the legend on the reverse.
Dutch born, New York raised, now in sunny Florida. Netherlands Kingdom, VOC, East & West Indies, Antilles, Surinam, Curacao, Aruba. Gelderland, Nijmegen, Zutphen, Arnhem. Belgium. Luxembourg.
There are many similar issues on past sales in the catalog. I submit a change request when I find them. Just change the Type under Coin identification to the correct coin.