From the 1957 edition of the Enchiridion Indulgentiarum (the Raccolta):
Jesu, via, veritas et vita, miserere nobis
Jesus, the way, the truth, and the life, have mercy on us.
The Raccolta recommends this prayer with these words:
"The faithful who devote themselves without compensation to the making and repairing of church ornaments and liturgical vestments, either privately or in institutes founded for this purpose, as often as they devoutly recite the above invocation, while engaged in this work, that they may thus sanctify their labour still more, may gain an indulgence of 300 days.
"Sacred Penitentiary Apostolic, June 2nd 1933 and June 14th 1949."
This specific indulgence was abolished in the reform of indulgences of 1967. In the current Enchiridion Indulgentiarum, all 'pious invocations' carry a partial indulgence.