The old mass I attended yesterday had the priest wearing green and offering the 12th Sunday after Pentecost. The preceding Sunday the, 1st class Assumption of Mary trumped the 11th Sunday after Pentecost.
Feasts in the 1962 calendar can be of the first class, second class, third class, or commemoration. (Some calendar reform was done in the 1950s.) When feasts of the same class fall on the same day, as happened yesterday, when the 12th Sunday after Pentecost and the Immaculate Heart of Mary both fell on August 22, then a feast of Our Lord takes precedence over a feast of Our Lady.
I think Mike has it right.
So what gives? Is your SSPX priest introducing novelties? Better watch him. :o)
Hey Chuck, you're going to the "old" mass? BRAVO! I promise I won't tell anyone.
From what I understand, either mass can be given. No?