According to this SOTW thread, the Studium model was produced by Dolnet and several other manufacturers. I agree that the horns pictured are Weltklangs with a couple tweaks.
Eb Alto Serial # ?
Bb Tenor Serial # ?
Fatal error: Uncaught mysqli_sql_exception: Table './bassicsax_petepiwigo/kah_history' is marked as crashed and last (automatic?) repair failed in /home/bassicsax/public_html/pix/include/dblayer/functions_mysqli.inc.php:132
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