These were really nice bikes basically Bridgestones top of the line bike in the late 70's early 80's being a 12 speed would mean it is 79-82 bike they started using the 6 speed setup in 78 or so and stopped selling higher end bikes under the Kabuki name around 83. In fairly nice shape I would ques $300-500 depending on actual components and condition. Lesser branded high end Japanese bikes from the 70's and 80's tend to sell for 40-50% less than equal quality bikes made by better respected Italian and American makers.