It is an early/mid nineties commuter/hybrid frame. Neatly made with triple butted spiral spline cromo. Same for the forks. Good stuff.
Koga Miyata is still in business. Their frames come from Hodaka since mid/late nineties. Before that from Miyata Jp. Koga always served the higher ends of the markets. Nowadays they're also the luxury division of Miyata in Japan.
Miyata Jp: Also still in business. Don't know where they have their frames made now, but it could very well be still in Japan.
They have a pretty advanced online catalogue showing for example bonded aluminium bikes. Don't know whether the frames are any good, but they look neat. Online catalogue =>
An other Japanese manufacturer, Panasonic, is also still in business. They for example do fine titanium bicycles that don't find their way abroad =>
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