Actually, it was a Rubin invention to promote startups...and it is somewhere in the middle of 1993, but the wording is a small US based company having less than $50 MM in assets at the time you acquired the stock (whether a start up or not). Many Naz companies qualified at the time, but during that time the only Naz company I held for more than a year was HAUP, and held it for less than five year and in a non taxable account, so I used the exclusion only in some companies that went public. Of course, if you can sell it privately, the same rule applies.
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