2N5064 200 V 0.8 A Silicon Controlled Rectifier.  This is an upgraded version of the 2N5060.
Direct replacement that was used on many early solid state Bally and Stern pinball machines. Used on lamp driver boards and other pinball boards.
Bally reference #E-00585-0014, E-585-14.
Stern reference #110-0074-00, 25A-5-5060.
Williams reference #5A-9014, 5130-09014-00.