There's a Trixie on the Terry forum For Sale By Owner forum, it says 50cm but they actually didn't make a 50cm, 48 and 52 are the closest.
http://www.terrybicycles.com/trade/browse/sell
Here's a picture and some geometry info from Sheldon Brown's website - this is an old webpage from 2001. It looks like it was sized based on the seat tube length so I'm not sure how meaningful those numbers are according to what we commonly think of as a 50cm frame.
http://www.sheldonbrown.com/harris/terry/trixie.html
Did you ever get any information on what size mixte frame to look for?



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and if the local one looks half as nice I don't think I'll be able to resist!
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