It was the standard in the early centuries of the Christian church, certainly not in 1939. In 1939 and since medieval times the standard would be a kiss on the cheek, later on it would be a kiss on the cheek for women or a handshake for men, in some cases only an embrace. If I remember correctly from my childhood (early 80s) in a Portuguese traditional catholic context, women would kiss on cheeks and men shake hands/embrace. Quoting from the wiki:
"In the Roman Catholic rite of the Holy Mass, as well as in the Lutheran Divine Service, immediately after the Doxology, the congregation will partake in the Pax or Rite of Peace. In most Western churches, this involves a handshake and the words "Peace be with you." When the people know each other, a hug may be substituted. Spouses tend to hug and/or kiss each other first before using the traditional handshake and "Peace be with you" for the other surrounding members of the congregation. In lieu of a handshake, a bow to each other is also used as the sign of peace, such as in China, where bowing follows cultural tradition. The bow is sometimes used in the West as a measure to avoid contagions during flu or cold season."
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