This is a short article from the November 1984 issue of Backpacker magazine on the introduction of the Whisperlite. Interesting read on the marketing strategy at the time. One thing that caught my eye in the article's picture was the presence of a washer and the use of a slotted screw on the burner cap. I don't believe I have seen anything but phillips screws on Whisperlites, and never a washer (just the screw only). I have one of these early ones, with the white/tan fabric fuel line, and it does not have a washer and uses a phillips screw. Is the one pictured a prototype and not a production model? Or an early version? Does anyone have one like this?