The cherished aqua blue colored First Class Radio Telephony FCC license.  The license that opened the door to many jobs in the broadcasting business.
In the early 70's the FCC relaxed operator license requirements and did away with the traditional First Class Radiotelephony license  subsequently replacing it with a lifetime license call the General Radiotelephone Operator License.
One of the many schematic drawings that Ogden students had to learn in preparation for the FCC Second and First Class tests.  This one is of a tuned radio receiver and is a simple schematic compared to others.
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William B. Ogden's Radio School