Nice watch with an interesting history. It was produced in 1964 to celebrate the Tokyo Olympics hence the flame on the case back. The case was embossed so these are often worn smooth but yours looks good (not too much brasso though !)
It was an expensive watch for 1964 costing 12000 yen
The second generation with the 6117A movement was issued in 1968 but Seiko made a mistake by putting London ,Rome and Paris on the same time line on the bezel. They quickly recalled the watches but I have one of the ones that got away