The Setun-70 was a 1970 evolution of the 1958 Setun machine. Both were ternary machines, with 6 trits to a tryte.

Perhaps most interesting here is that where the '58 machine had an accumulator, the '70 machine had an operand stack.

More info at http://ternary.3neko.ru/setun70.html and of course at http://en.wikipedia.org/wiki/Setun