Upavon Chadwick's 477 Substitute is as close as currently available to the original Chadwick's 477 wool yarn used by Frank Sawyer in his definitive Pheasant Tail Nymph — the warm, muted pinkish-brown tone that Sawyer used for the body of his original pattern and that no standard dubbing or yarn quite replicates. Use it for Sawyer-style PTN bodies and thoraxes, for traditional North Country spider bodies where the subtle pink-brown hue is part of the pattern's identity, and anywhere else the original Chadwick's shade is specified and you've been making do with a compromise.