The "miraculous medal" is one of the most popular items of Catholic devotion. Its prayer of "O Mary, conceived without sin, pray for us who have recourse to thee" dates from 1830 and the visions associated with a young French nun called Catherine Laboure. The first miraculous medal was made in 1832 and they have been made continuously since then--with the same year date--1830--as a commemoration of the year of the vision.
Don....