pages missed

Hi
Some pages are not available. I am trying to open the page for NUMUS PRUSSIA 1664. It was before, but now not.
Why?

All services seem to be online

https://status.numista.com/

Can you post a link because numus and Prussia don't really go together (there are quite a few centuries and quite a few hundred km separating these terms).

Numus is version of Prussian Schilling for 1664-1665, etc. 
Schrötter# 1921,1922
https://www.ma-shops.de/loebbers/item.php?id=221010196
Before, it was the page for this coin in Numista. Now there is not any information.

Hello,

I can see no sign that this coin has ever been listed on Numista.
We have Schrötter# 1923 (N#126763) but not 1921 or 1922.