A single buff business envelope, front and back, printed with the Barbour's Irish Flax Thread three-ply trademark (a hand holding a flax plant) and an advertising line urging users to check that linen thread carries the trademark. It was sent by Mary E. Bradford of Roxbury Station, Massachusetts, to Mrs. James Whitaker in Upper Troy, New York, and is postmarked Troy, N.Y., July 28, 1906. It is useful as an example of early twentieth-century thread advertising.