The Teachers was produced between 1962 when they started using the jigger cap and 1987 when they stopped. There's always interest in this Teachers as many people remember them.
With the Cutty Sark and J&B I'd need to see the labels to date them but I agree they should be around the same time knowing they were given at the same time.
The only way to tell if they're drinkable is to open them but if they've been kept in good condition, away from heat and sunlight then they should be fine.
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