Beneath the coffin, a portrait of Casimir encased in silver shows the saint with three hands. Some say this was to emphasize his generosity – he gave as if from three hands. Another suggestion is that the anonymous artist didn’t like the original right arm he had created, so he painted another one over the top, but the colors of the original reappeared, some say miraculously (Source).
The theory that the third hand was a mistake would lead me to conclude that he isn’t typically associated with three hands and so that depiction is unique to this icon.
I found a wonderful video on the bio of St. Casimir, but no where do the pictures in this video indicate a fluke with 3 hands. Probably the first explanation of the artist not liking the first drawing of a hand and he drew a second one and over the years, it bled through the painting.
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