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For frames from about 1984 to 1990, one can use 33% to 80% of the original selling price.This is for frames in good to excellent overall condition.
For frames 1976 to 1983, one can use a range of 40% to 100%.
The prices are a combination of list prices and selling prices.
(If you have any pricing on Trek steel road bike models, please send it along so it can be added here.) 515 730 (frame) 412 412 413 (412?
You might need to try for a few weeks to find a bike similar to yours, if it is not a common model.
To compare a local sale to an e Bay sale, you should add the cost of shipping to the e Bay price.