On the Calendar Schism of 1924...

The schism that was proclaimed in the Orthodox Church from 1924 with the calendar reform took several decades to be completed, despite the fact that its recognition and response to it by a Great Orthodox Synod did not take place as expected. Of course, this does not mean that the schismatic and already heretical-for-decades Ecumenists enjoy immunity, because they are "self-condemned" and mainly suffer from sacramental and soteriological issues. However, for the period in question (1960), the communion of those who kept the Patristic Calendar and had an Orthodox anti-ecumenical mindset with those who accepted the Innovation, directly or indirectly, did not deprive them of the sacramental Grace of the Holy Spirit.

If in the life of the Church, the Grace of the Priesthood is automatically interrupted due to violations of the Holy Canons or of the Faith, then, as Saint Theodore the Studite affirms, it would have been “retroactively” lost in the distant past.

Source: Σύντομη Ἱστορία τῆς Μαρτυρικῆς Ἐκκλησίας τῶν Γνησίων Ὀρθοδόξων Χριστιανῶν Ἑλλάδος καὶ περὶ τῆς Ἀποστολικῆς Διαδοχῆς Αὐτῆς [A Brief History of the Martyric Church of the Genuine Orthodox Christians of Greece and its Apostolic Succession], Holy Synod of the Church of the G.O.C. of Greece (Athens: 2015), p. 80.