For me, the rarest would be the Buck Rogers bicycle.
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I’ve only seen it illustrated in this book which highlights the various items that were made
with the Buck Rogers theme.
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It’s not really something I would like to have. I’m just curious to know if anyone
has ever heard or seen one.
I once owned a Schwinn Aerocycle. Checking into it’s history, I found that the Aerocycle
made in the 30s “depression” was expensive for the times & not many were sold.
Making it rare today.
Schwinn came out with a lower priced model which was the “cycleplane”.
Although I’m not 100 % on this. The Schwinn experts would know.