The frame is Tange Prestige? My limited experience says $350-400 with the chewed up paint. Maybe more, based on wear and tear (or lack thereof) on components. Better pictures will help the more knowledgable members give you a more reliable figure.
...and welcome to BikeForums!
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera