Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
He would keep several rods at the shop and show them to visitors asking which they preferred. They would all test them out and invariably pick the one that said Orvis. The other rods were exactly the same with the Orvis name either covered or rubbed off. He always let everyone know of his trick afterwards of course.