BYX48 900R stud rectifier - AEI Semiconductor

BYX48 900R stud anode rectifier in a DO-4 package by AEI 

I f(av)  6A   Ifsn 90A   Vrrm 900V

Download general BYX48 900R specsheet: 

Status: NOS (new Old Stock) predates 1967 when AEI was absorbed by GEC and "ceased to be" as a brand

RoHS: no