Vintage Trek Gallery - Kevin Maher's 1978 Trek 530 Steel Road Bike and Another Look-alike

http://www.vintage-trek.com/TrekBrochure1982.htm the 412 could fit the bill

Another idea: could there have been damage to the rear dropouts, which prompted someone to repair and repaint, leaving the trek embossed nowhere? Also could this be a late Ishiwata/O22? At the end of the period of these models the Ishiwata was dropped.

Vintage New Belgian Superia Ishiwata 022 Steel Frame Frameset Campagnolo | eBay