4655KAR7,
10K -3',
shipped date  mar, 12, 1956,
catolog # CL670Y,

cant thank u enough for the information i have obtained from you and your web site 
i recently picked up a SBL 10K and am restoring it for my own shop ,
IT was purchased by the last owner 29 years ago at auction from
CAL POLY TECH which is one of our finest ca state colleges in San Luis Obispo ca.