Oilit
Cruisin' on my Bluebird
The Wasp was a ballooner, but Schwinn offered a heavy duty version, and the chain guard usually had a "Wasp Heavy Duty" decal when it was. Then Schwinn offered a heavy duty version of the American, which was a middleweight, which became the "Heavy Duti" of the late '60's, which were all middleweights through the end of Chicago production. It can cause some confusion. I missed out on a good deal on a Wasp Heavy Duty because I was confused, and I've never forgotten it.
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