Tyre age

[gpmini]

Hi there

I need to estimate the age of some tyres. Other than checking the production date on the tyre wall of the 175/50x13" tyres 2nd from the right in the back row, the tread pattern may give a clue to the age. When did Yokohama stop making this tyre tread? I got these off someone in the Cape (with Wian's help).

Anyone selling 175/50x13" second hand Yokohamas? A friend is looking for a set for his Mk1 Escort.

Thanks,
Leon