Here's all I could find
https://silverbobbin.com/necchi-sewing-machine-models/
Looks to me, from the pictures, the regular Supernova (not the later Ultra which is not pictured) is the only one with a trap door for cams, and it looks to be a straight, high shank as far as feet are concerned? At least to me.
Looking over here
https://www.vintagesingerparts.com/collections/necchi
it appears the same foot fits several different models.