A sneaky memory from my childhood.
My brother and I spent a lot of time being very friendly with a local garage when the DUNLOP GROUNDHOG TYRES were being advertised.
We both loved the Groundhog and had many promotional items - keyrings, stickers and a Groundhog bubble bath.
I refused to part with my dolls pram because of the I'M A GT GROUNDHOG sticker that I had put on the front.
I still have the sticker ( my Mum managed to get it off the pram) and the empty bubble bath bottle. And some years ago my brother made me some Groundhogs using the keyring as a mould.
I found this while I was looking for information . . .
it would seem that Dunlop tyres last for a few years.