If I have deciphered the serial number correctly, the bike is of Japanese manufacture from September 1995, frame size 54cm. That would make sense given the componentry (8-speed 600, MIJ Ritchey parts. In case it wasn't apparent from the images, the tubing is Tange Prestige Road OS. Seemingly few examples of production bicycles using the OS steel tubesets but I guess by the time they were available, aluminium and even carbon fibre frames were hitting the market.

This frame has very similar ride qualities to my newer Ritchey Road Logic 2.0. The tubing diameters are the same but the Ritchey Logic tubing is triple butted, vs. double butted for Prestige. The lineage between the two is undeniable; the Ritchey is a modern analogue of the Prestige - it even came equipped with a complete 6800 Ultegra groupset. Really, the componentry differentiates the two bikes moreso than the frames.

I will post better photos as soon as I am capable.