What frame is this?

Proto2000

Retro Guru
Local sale for this bike but cannot find anything that looks close on the net. Cable stops on top tube are a bit unusual and looptail makes for very interesting searching. Welds seem to be smoothed over as well, likely not a Trek.
 

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It is listed as an IBOC but no pictures I have seen are with the cable stops like in the pic. Maybe a Schwinn, have one that uses the steel stops riveted on and that silly no clamp seat post they used, kinda like a quill stem.
 
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