Just traded a guy for this classy Vista mixte. It's also made ARAYA 631, whatever it is. Like wdpayne's, this one also has a 26.2 mm seatpost. A nice bike, needs recabled, new bar tape, and a tire upgrade, but it looks like a really nice ride. Alloy stem, handlebars, derailleurs, shifters, crankset, nice 700c rims machined for presta valve.

Serial is ARYB151955. It's got a Suntour Vx rear derailleur that appears to be original to the bike. The derailleur has a stamp code of WG, which is Suntour speak for July 1980. So this bike is likely an '80 or '81.

I especially like the front brake release located on the headset-mounted cable stop.


Photos at link.
https://goo.gl/photos/MQmARADNJLc6ZhVM7