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The Seeburg 200S3-L6 marked the debut of the Select o matic Mechanism. The design naturally evolved, undergoing many revisions. The 3 ranges of Serial Numbers are shown below. The final version of the mechanism as we know it going forward began with Serial #1101. It was this version that served as the basis for the 100A Jukebox.
Periodically I will quickly search the web to see if anything new has surfaced regarding the 78 RPM Seeburg Library Unit. Recently I bumped into Mickey Treat's 2-part video introduction to one of his recent (2020) acquisitions.