Hey folks.
I picked this up for cheap a little while back. I am assuming it is Japanese in origin because of the Tange dropouts, 26.8 seatpost diameter and overall appearance. It measures 62cm c-c on the seat tube and 57cm c-c on the top tube. You'll notice there are no eyelets and the geometry is quite tight, perhaps indicating a racing frame of some designation. And no, the area with the missing paint is not where somebody has hacked off downtube braze-ons (thankfully).
The serial number, 00600, is puzzling me the most. I've never seen such a format before.








Any ideas?