Well so did I.

Thanks to a gentleman from Italy and our own Triplerocky, the mystery has been revealed.
I did a writeup for Wikipedia on the Suzuki GT Series and mentioned the 384cc anomaly in the Italian market. A kind gentleman wrote an explanation in Italian. My Italian is kind of rudimentary so I asked Rocky to translate for me which he kindly did.....adding further info to the explanation as well.
Here's the story:
At the beginning of 1975 (calendar year, I believe) the Italian government instituted a ban (or maybe heavy import taxes) on motorcycles smaller than 380cc and lighter than 170kg.
This was done after lobbying by Alejandro de Tomaso who had recently bought Benelli and Moto Guzzi and was apparently an attempt to protect the small bore domestic bike industry.
Suzuki, not wanting to miss any sales in such an important market, simply increased the bore of the 380 from 54mm to 55mm and....voila....384cc displacement. They also made sure that the frame data plate read 171kg regardless of the real weight of the bike.
This effort must have been successful as the 380 went on to be a big seller in Italy.....so big in fact that, if I have it correctly from Rocky, they continued to sell the 380 in Italy until the end of the 1980 model year.
That would surely rank Italy as the last place on Earth still getting 3 cylinder GTs of ANY size during that 1978-80 period.
So now you know....The Rest Of The Story!!! (done in my best Paul Harvey voice)
