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Old 11-29-16, 11:26 AM
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Here's a pic of a 1981 Trek 613; the bike came with a 531 main triangle:

Vintage Trek Gallery - 1981 Trek 613 Steel Road Bike

It looks like daily commute could be right on his ID and this could be a 1981 600 series Trek with a 531 main frame/hi tensile steel fork and stays; the full 531 frames were generally the 700 series.

Here is the brochure:
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