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Needs to be an early 1980's to start with. Say 82.
Able Archer rather than Twilight 2000?
What mark would be most common?
Just to say lads that Chieftain did not use II except the Drivers night sight which was carried as a spare and had to be fitted. I.R. was used for a limited time in both passive and active arrangements but was poor. The drivers IR headlights and the searchlight and commanders spotlight had I.R. filters .
No substitute for real knowledge of course.