Putting the serial number UT3318 into the Ric decoder, says it's an amplifier made in 1981?? UI3318 is a 1981 guitar.
Apart from that, it looks almost identical to this one, except the colour obviously. Got the same 4 screw bridge, split pick guard and Ric-o-sound sockets. http://www.gbase.com/gear/rickenbacker-4003s-1982-autumnglo