Considering the current Church crisis, which missal is used is up to the traditional group, and it should not be held against those who choose to use a particular missal at this time. The last acceptable version is indeed that of 1962, even though it does not have as much as compared to the pre-1955 missals. When things are restored in the Church, this issue will finally be addressed authoritatively. I remember learning that the SSPX even was more easygoing in its early history about which missal to use. I think even the 1965 rite may have been used at Econe. I know from a talk of Bishop Sanborn and/or Fr. Cekada that the U.S. SSPX priests used the pre-1955 missal and that France used the 1962 missal until Archbishop Lefebvre imposed the 1962 missal on the SSPX in 1983 because of dealings with Rome. I also learned from an article and a talk of Msgr. Perez that later on Archbishop Lefebvre had contemplated imposing the pre-1955 missal on the SSPX after the 1988 consecrations, but he died before doing anything about it. I must admit though that I would say also that the pre-1955 missal is much richer than that of 1962 aside from just the Holy Week rite differences. Three collects were usually said on Sundays, more vigils and octaves were celebrated, the older classification scheme of feasts was preserved, and certain specifically Roman feasts are not found in the 1962 missal, although Pius XII had kept them in his missal reform, which I believe the CMRI uses. Now after 1962, it is downhill especially from then on. The 1965 rite was more of a transitional form, even more so than those earlier reforms of Pius XII. It was a lesser organic form of the Roman rite. Then after that I think many here already know what happened in 1969.