Victor Brumby in Italy in September 2012.
I followed a tractor and trailer in the countryside at dusk near Orvieto last week, which had both tractor and trailer plates in medium BLUE on yellow, not black on yellow as usual. The trailer carried the same registration as the tractor (which I seem to have lost!), but had the red ‘R’ for Remorque (trailer). These were both pressed plates, not painted. It was too dark to take a photo, and indeed, my Italian would have been inadequate to explain to the rustic worthy who piloted the machine, the bizarre concept of xenoautonumerology – and his part in extending the boundaries of the science. In other words, I couldn’t stop him, explain and photograph. BUT – I DID follow him for about 6 kilometres before giving up.
Days later, I saw another blue on yellow tractor plate, that time without my camera (I am too old to use a smart-phone with built-in film unit) and the system was identical. However, most of the many other ag. tractors and trailers I saw were as we usually expect, viz: black on yellow.
I await a response from out Italian pals, who may know of this type.
March 2014……Well – no-one else has reported this blue/yellow ag. plate AND I have been back to Umbria to search for it, during 2013 – so I must explain my faulty experience by reference to one or more of the Italian beers which I enjoy before I go spotting in the Republic!
Moroni, Moretti and Magneto Marelli can all share the blame!!
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The paper temporary plates are still sometimes to be seen – see 27140 P 5. The first I photographed was in 1965, 51962 C 1, so that type has been running for a long time!

Circa 1965, this new Fiat 850 carried temporary plates while it awaited inspection and allocation of its permanent plates. Code C1 is for Bolzano region. Brumby archive
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RPWO mentions that personalised Dealer plates are permitted, which explains this oddity, seen at the customs yard at the Adriatic port of Ancona. Perhaps this dealer trades in importing and exporting vehicles?
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In Trento, just before commencing the Brenner Pass into Austria, I paused for lunch (at an excellent Japanese restaurant – unusual for Italy!) and found this this specially-plated Civil Defence 4wd with the TN code for Trento.

Trento is one of the three areas issuing these official Civil Defence PC plates, with Bolzano and Aosta.
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An unusual DAF 33 belt-drive car from the 1960s was awaiting photography in Orvieto, bearing the old black series plates. In amazing condition, and clearly the owners’ pride and joy.
Hello Vic,
Interesting info – just keep on with this blogspot.
Bernt
Hello Vic,
there is no new Italian agricultural plate type, I have checked.
My guess about the blue on yellow ones is that they have been repainted, due to fading, with the old motorbike colour. Some body shop might still have a few cans.
Marcello