datasheet wanted: NEC AC06DGT

Ok, I put it here because this is not for audio. But I'm trying to get an old camera working again. First step is getting to understand the electronics and so far I have been able to trace the pcb (good thing is was only double sided) and find almost all the components. But a single component so far is missing.

Does anybody has a datasheet for a NEC AC06DGT? This is a part in a TO-66 (*) package, which looks like a small TO-03. I did find some references to NEC ACxxxx parts and those are thyristors. But I'd like to be sure about this.

(*) or TO-123 or TO-124 or TO-213 depending on thickness of the base