1970's ones from Lorne Surf shop? Scroll down on the link.
A Lorne Surfshop board sold on eBay the other week for $300. Old 6'9 Single Fin... circa 6'9 anyway...
www.surfresearch.com.au/mo.html
Give that guy a call right now. It's just listed, and under valued... Get over there this morning, and get it off him for $120...
You can re-list that board on eBay, and hold out for $400...
There's no photos of the bottom... The deck looks good. I would assume the bottom would also be fine.... Condition looks like 7/10, maybe...
Just put you eye over the bottom, and make sure it's not twisted, or warped...
There's a chance the bottom either has some de-lamination - from the sun, or even worse, some shrinkage of the foam... but you will notice that...
If the bottom side hasn't been "baked" in the sun, then that board is a (potential) bargain!