On the front, below where it is written "International Driving Permit", it is written the convention date of 8 November 1968.

@Pete ******

I stand corrected, I should have written 1968

@Pete ******

I cannot comment on the veracity of the reply to my post, I am correct however when I say the 1985 permit is valid for one year.

I am in the uk and got my IDP yesterday. There are actually 3 different ones, for thailand you need number 1985. This costs £5.50 but only obtainable from Pay Point shops. Formerly it was the AA, then Post Offices, but 2 years ago taken over by PayPoint. This is the easy bit as not all shops will be licenced for the 1985 one. Depends where you live, they pay for providing any or all of the 3. I had to phone up 3 shops to find one selling the 1985 one that covers thailand. You will need your current drivers licence where the shop will fill in your driving entitlements, also need your passport and one passport photo. I get one every year and they are valid for one year.