Looks completely legitimate. The cal 890 movement is fairly rare, as it replaced the ultrachron line but was itself soon replaced by the 99x series with a different barrel setup. Although NOS, would probably have it serviced (I can't read enough Italian to tell if they have done this), which will set you back a bit for this movement. In terms of price, that is really up to you. I would recommend searching Ebay for other Longines to get an idea of what's available in that price range and seeing what else you might like. I can tell that across the board the prices seem to be higher than they were a year ago. As far as an Italian seller, Longines are quite popular there and I have had two great purchases from Italian sellers.
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