
I would say around 1977-1978. I think Accurist is an English company. The light would have (I think) come from tritium behind the lcd panel in front of the reflector panel. I have had them apart. I might even have one I can take a shot of for you so you can see. The tritium has a life span of 10 years or so. There has been a thread on here on the forum about tritium where someone did a great job of replacing it (not cheap though).
Adam