For those that have access to a copy page 58 of Peter Connolly's Hannibal and the enemies of Rome has a nice summary of the development of Celts swords. It is brief but does give the dimensions - unfortunately he does not postulate as to why sword lengths increased from 55-65cm (450-250 BC) to 80 or 90cm by 120-50 BC.
I don't think we can really submit statues as evidence of size - lets face it all men from the Greek Islands would be hung like a horse based on the statues your other half brings back from a holiday!
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