Dunlop Double "o" tyres or Dunlop 00 tyres?

[Sharky]

It's intrigued me for a while now, but I remember reading through my Dad's Cycling mags, pre 1960 and an add which always stuck in my mind was an add for Dunlop Double O tyres (or Dunlop OO tyres).

However, no matter how I try to google them, have never found any info on the web.

Does anybody remember them or have I imagined it?

Cheers

 

[Hover Fly]

Stretching my memory here, also to father’s old magazine adverts, but I think Dunlop’s hp. Tyres were given names like “Sprite“, “Road Racing” etc, while their tubulars-made on the continent, incidentally- were given numbers