E4504/M/16

Equivalent ACR13, NC18, ACR21, VCRX263, 6ED8, VCRX166,
53271
Similar type  
With different Vf  
CV number CV282, CV966, CV1397, CV2137, CV2810
Swedish Mil.nr. M2727-426
Phosphor Blue flash with yellow afterglow screen, 20s persistence.
Army ZA or ZC ZC23359