152-0177-00
Tektronix part number 152-0177-00 is a 10 mA germanium tunnel diode with 4.7 pF maximum capacitance in a DO-17 package.

It is used in the 7S14/5S14N and the 7T11A. Subsequent versions (generally with better specs) were the 152-0177-01 and 152-0177-02.