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@jimalex
Check that all the tubes look true (see pic above), then you need to lay your hands. Touch the bike all over, especially at the junctions of the tubes. Minor dents or bumps may not be noticeable by eye but you'll feel them. Ripples in the tubing near the lugs at the front of the top or down tube mean the bike has been in a head-on crash at some point. If you know the make of the frame Google it and check the provenance. Know what size frame fits you and check that too. Sizes given as a single measurement usually refer to the seat tube length whereas the top tube length determines your reach and has a huge impact on how comfortable the frame will be for you. If you can try before you buy then do. Other than that check for the quality of brazing or of the lugs if relevant. Chunky lugs that stand out from the main tubes indicate mass production, whilst tapered, streamlined lugs point to hand finished work.