2N2405 ,Transistor, NPN, 

RCA - 2N2405 - Transistor, NPN.

High Voltage , Current & Fast Switching Transistor, Triple Diffused.

Max voltage: 90V.

Max current: 1Amp.

Dissipation: 1 Watt.

Package: TO-39 gold leads. 

Genuine Vintage RCA - New Old Stock

Note: Silicon.