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I enquired about the top tube length c-c and have been told that it's 20.5", or 52cm. That is very short indeed for a size 17.5. In fact it would still be short for a size 14!
It reminded me of a test of a much later 853 M-Trax in which the tester complained of the short top tube - was a short top tube a particular feature of M-Trax designs?
PS
The seller was very polite - always a good sign in eBayland I feel.