When put-side-by-side, it is easy to tell the real ones from the modern-day reproductions:  both the cloth and the thread are entirely different from those used for the old patches, with the differences even more apparent when you examine the back of the patches.
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The best way to be sure that a patch is genuine??  Find it sewn onto an <a href="/Guide/_Accessories/4.Patches/a.Real_Ones/?show=jacket.JPG">old jacket</a>, with some vintage hair grease around the collar and a few other old patches attesting to its age.