Is john wanamaker silver flatware sterling if it is marked s and jw a bird lxvi?

Yes, John Wanamaker silver flatware marked with an "S" typically indicates that it is made of sterling silver. The "JW" signifies the maker, John Wanamaker, and the bird symbol is often associated with the brand. The "LXVI" could refer to the pattern or design used. Always verify with a reputable source or appraiser for confirmation.