How old is this tyre

[Skull]

Skull's tyre

Michelin Energy spare tyre on my 1999 built Xantia.

DOT Code 379

It can't be 37th week of 1999 as the car was built 27 JUL 1999.

So would it be 37th week of 2009

[bobins]

Three number codes were in use pre-2000, four number codes were 2000 onwards, so yours must be 37th week 1999.

[Skull]

Cheers Bobins that makes sense despite what I wrote earlier