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3 Speed Balloon tire Rollfast?

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Is the ad below for a unicorn frame?
It's close, but in this thread (Post #21) @mrg posted some close-ups of the rear brake mounting bracket, which looks to be brazed to the back of the seat tube. The EBay frame shows no signs of a brake mount.
 
@mrg, going by this ad the mounting for the rear brake looks like it clamps around the seat post instead of being brazed on. That must have been another detail changed in production.
Good eye@Oilit! never noticed that, wonder if there any like that out there but probably a pre production thing?, last pic is my rear brake bracket

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Clear zinc is not just a single plating of zinc. We use this plating on our brass grommets and we call it bright zinc.
Clear Zinc plating refers to a colorless chromate conversion coating that is applied over zinc as part of the post plating process. Clear chromate or passivate protects the zinc layer and offers additional protection against corrosion.
Thank you for that great info!
 
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