Agitator out of a Fisher and Paykell Washing machine. Can't remember the model number - it died and we got rid of it ages ago but held onto the agitator as we bought it new as a replacement about a year before the machine itself died.
Looks like it suits all of their machines : https://www.fisherpaykel.com/nz/assorted-spare-parts/agitator-425025p-425025P.html