Both shakers are embossed on the bottom with Luce MFG Co, VT., Blue Magic and I believe PAT. Pend. This is a nice big set that have lots of vintage appeal. The blue lettering is vibrant still.

Paper AD not included:

Blue Magic Salt And Pepper And Canister Ad 1951 This is a July 1951 advertisement. Blue Magic which is a trade mark of Luce Manufacturing Company of Groton, Vermont. Ad pictures the salt and pepper set along with a canister. Ad reads, Blue Magic absorbs moisture, keeps foods crisp and salt free flowing. Kitchen range set is made of square cut white glass.