DescriptionIncluded is a description card from the Transistor Museum that says, "
Device ID: Fairchild 2N1613 transistor
Type: Silicon NPN diffused planar
Case Color/Style: Silver metal TO-5
Vintage/Date Code: 1960s/1970s
Use: The first "Universal Transistor"
Notes: Fairchild's planar process was key to modern semiconductor development."