Actually more common than you think - especially as you go backwards in time into the early 70's, 60's and 50's.
If memory serves me correctly - more common with Swiss bikes? Been awhile since I've looked it up..
Robert Shackelford San Jose, CA USA
Quoting Greg Williams <foolonawheel@gmail.com>:
> I just bought a quite nice Zebrakenko Olympic Ace from Craigs List
> yesterday. Nice orange and green. Posted a photo at
> http://www.flickr.com/
> that he bought it about 15 years ago from the owner of a now defunct
> bike shop. The owner supposedly built it up for his own use (which
> would explain the odd mix of components). Because the price was so
> reasonable I didn't really examine the bike when I picked it up. Last
> night I noticed that the bottom bracket fixed cup is on the left and
> adjustable cup is on the right! The cups are English thread.
>
> I havn't dismantled it yet but I'm wondering if anyone has ever seen
> this. The only explanation that I can think of is a factory error
> when tapping the bb (but that seems like it would be hard to screw
> up).
>
> Thanks,
> Greg Williams
> Kansas City MO
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