The Tetragrammaton that Arch Bishop Lamy had carved on the keystone above the door on the St Francis Cathedral in Santa Fe, NM., bears a resemblance to the one on a candle stick found in Lamy's home town cathedral in Clermont-Ferrand, France.
In St Louis at the Basilica of St Louis, King of France, a Tetragrammaton was carved above the church entrance in 1834. Lamy must have seen this Tetragrammaton on his numerous journeys through St Louis.