This was an attempt by Italjet to build a roadbike based on their successful 350T trials bike. As you can see, it ended up being a strange mismatch of parts.
The bike was such a disaster that Italjet avoid mentioning it! Found this comment on a website that explains why.
The late Bob Lawrence of Hailey, Idaho was possibly the only U.S. Italjet dealer to actually sell a couple of Casual 350s. He told me that they each came back with debilitating electrical problems within days, sometimes hours. He gave up trying to sell the last two new ones he'd taken delivery of and pushed them into the back of his warehouse. They were still there, with no miles on them, when I took the above right photo in 1993.
However, if that hasn't put you off, the blue bike is currently for sale. Advert.