This hard rubber (HR) MP is stamped with Max Keilwerth's Pure Tone Trade Mark logo. It likely came with one of his saxophones.
The MK MP's that I have seen usually have a metal band along the bottom, and since this one is missing, I can only assume that the MP was shortened for whatever reason.
Source: zoltiimro4 on eBay.de
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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