Back in the 1960's before the introduction of the new mass, the only prayers
that the Priest said in Latin were the offertory prayers.
The Mass I served was in the Dominican Rite at St Dominic's Church in
Washington, DC.
At the presentation of the water and the wine. I was required to repeat
as an Altar Boy these three Latin Words: Bene Dici Te or Bless these Gifts.
I started out in 1956 in an all Latin Mass, than in the First Sunday of
Advent of 1964 the changes were starting.
I never served the New Mass.