​​​​​​It is starting to smell like a Miele. I hadn't even thought of Miele which is funny because I own an early-to-mid 1980s, lower end Tange, Suntour/SakaeRingyo equipped model (workmanship, weight and general feel are not comparable between the two frames). The rear dropouts are practically identical. I guess with Miele I expected the usual engraved "Miele" on the fork crown and serial number on the lower seat tube. I'm guessing the model can't be identified with the limited information we have? Perhaps a Lupa? Thanks again for helping out!