There is a copy of the Dette's 1935 catalog on here someplae? But I can't find it? But that is no one's falt but my own. LOL

Back in those time's we used but two color's of thread 98 percent of the time. Black and white.

In the catalog they do not list a thread color for any of there flies. But I have some of there flies and white is the correct color used on that pattern.

In the catalog on here the pattern is as follows.

Gordon Quill: Quill Body, Blue-gray Tail, Blue-gray Hackle, Tan Speckled Wings.

One thing to remember they also tied flies the way the person ordering them wanted them.. Some may have ordered those flies with black thread? One never know's.

The white thread we used back then would take on the body color most of the time. Not like it was the same color but it would be close. I still have a bunch of it left to LOL. Ron