Bought my 1st Audi May 25th 1988

[tonupkid]

It was an Audi 100
Here's the purchase receipt followed by selling it about 7 months later.
I made a profit of about £400 (almost 10%)
The buyer called me late on a Sunday evening. He was on his way to Heathrow and needed to view it there and then, so I had to hot-foot it over to my warehouse where it was stored.
It was dark, late and isolated. I was not entirely comfortable faced by three foreign gentlemen and a few grand in cash. They were however fine, did the deal, paid and left.
The car was later collected and shipped to Hong Kong.

What is the most ancient date any one here had their first Audi?