100 Schilling 1975 "Olympics" mints incomplete, also year probably wrong

Hi,

i think this 100 Schilling "Olympics" coin (KM# 2927) needs an update on the year and mintages:

https://en.numista.com/catalogue/pieces15387.html

Mintages are locked so i'm writing here. Maybe i'm also wrong, then please point me in the right direction. I didn't find the coin i was looking for, a Proof "Olympics" with Vienna Mint Mark in the numista catalog.

But i did find Information in some other places:

https://www.ngccoin.com/price-guide/world/austria-100-schilling-km-2927-1975-cuid-1045924-duid-1217914
https://en.ucoin.net/coin/austria-100-schilling-1975/?tid=32452
https://colnect.com/en/coins/coin/1829-100_Schilling_XIIOlympic_Wintergames_Innsbruck-1945~2001_-_2nd_Republic_Schilling_Commemorative_100_%C3%B6S-Austria
https://de.wikipedia.org/wiki/Liste_der_%C3%B6sterreichischen_100-Schilling-Gedenkausgaben

These all list the mint date as 1975 - the numista catalog says it is 1974. Also 3 of the 4 above list normal, proof and "handgehoben" (aka special unc) for both mints, hall and vienna.

Could someone please check and possibly fix this?