Hi LaDonna,

Thank you for contacting Mearto with your appraisal inquiry.
It's always difficult to know how much added value a provenance will bring; a standard White King Zephyr Special saxophone of this age typically brings $300-500 at auction but I've adjusted the price up from that assuming the provenance can be proven.
Based on the photos and information provided, and subject to examination, this is:

A vintage HN White King Zephyr Special brass alto saxophone
Serial number 273907, made in 1945, in Cleveland Ohio
with a fitted and lined hard case
CONDITION: appears to be in good condition; value assumes reasonable musicality for age
PROVENANCE: purported to have been played in the Stan Kenton band
$500-700*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.