The Toneking alto and tenor switched over to the "Superba Style" keywork at almost exactly s/n 68000.
The baritone switched to the new keywork and new bell-to-body brace at about between 83602 and 88xxx.
The straight Bb soprano may not have changed until the SX90 came out, around s/n 99000 (1993).
My (Pete) opinion is that all basses were custom made -- and I've only ever seen one Toneking bass.
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