79HGK negative voltage regulator - RS Components

 79HGK negative voltage regulator from RS Components.  

Package: 4-pin (gold plated) ,  TO-3  

Download RS Components posthumous datasheet ( really rather good !) : 

RS. Components part number : 307-878  

Status: NOS (New Old Stock)    circa : 1979  

RoHS: no    ***Please read warning contained on RS datasheet***  

This is one for the collectors !  you certainly would not want to use it.... is this one in a million, well ... looking at the stock lists it's about one in two million, so quite fair to say it's a rare one.

The pin markings and the clipped case are original features.