Seller told me early 90s. I don't know why a custom build has such a long stem. It's a nice Salsa one at least. Interesting mix of parts and many of them pretty modern. Modolo CF bars, Easton CF post and the Selle Italia saddle is the CF rail model.
I'm not up to date on Shimano history so I don't know if the drivetrain is older than the frame. The 7 speed with down tube shifters could well be though.
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“Life is not one damned thing after another. Life is one damned thing over and over.”
Edna St. Vincent Millay