This ad dates from 1984 and is for the Levi factory up at Dunsinane, even although the address doesn't crop up in it....tele-communication only it seems!
A reminder that there is a photo of the factory interior in the October 2009 archives.
As you can see, Levi denim was so tough, even attaching them to 2 mules heading in the opposite direction couldn't rip them apart!
Staying with denim in the 80's - I remember in 1982 I visited the town in the South of France from which denim gets its name. Nimes - as in (from Nimes "de Nimes") - then shortened to denim.
The thing about it is though, being on the Mediterranean coast - it was far too hot to wear jeans, everyone just wore shorts!!