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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Stack trace:
#0 /home/bassicsax/public_html/pix/include/dblayer/functions_mysqli.inc.php(132): mysqli->query('\nINSERT INTO ka...')
#1 /home/bassicsax/public_html/pix/include/functions.inc.php(538): pwg_query('\nINSERT INTO ka...')
#2 /home/bassicsax/public_html/pix/index.php(373): pwg_log()
#3 {main}
thrown in /home/bassicsax/public_html/pix/include/dblayer/functions_mysqli.inc.php on line 132