Anyone recognize this old handbuilt touring bike?

Tengrainbread

Warming-Up
Nov 3, 2019
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I have this fillet-brazed frame that looks to be from the 70s or 80s. It looks repainted, without decals. It says Toei to me but I don't see any Toei stampings anywhere on the bike. The serial number on the BB is MVF5559. It takes 650A/B wheels and the fork steerer is marked Tange.

Any Japanese handbuilt bike nerds recognize it? Or recognize the serial number format?

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