All this talk and footage of old longboards made me dig this classic out from under my house. Had it for about 25 years and prior to kids use to have it mounted on the wall. Rode it a couple of times in the 1990s and struggled to turn the big girl so I stuck to the short board. I will have to take it out from another spin.
It is a Gull Custom and based on the logo and research from the net, I date it at about 1958/9? The diamentions (off a tape measure as there are no markings) are 9'6" x 21 3/4" x 3 1/8" and weighs a ton. I believe it to be made in Brisbane.
The below link helped me with some of this history:
www.woosleysurfboards.com/history.html