Thanks Jack.

I'm no expert on mowers but having googled the name and landed on this forum (the only place on the net in Australia that has anything to say about them, as far as I could find) I see that someone else had posted some photos of their collection some time ago (2013 from memory) and there appear to be 2 victa electric fair light models. One is the green one the other, the Fairlight 400, is all white, which is the one we have. Also, from some old threads on this forum I believe there is one in the powerhouse museum, although which model it is I have no idea.
Here's a thread that has pictures of our model.
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=31511

We don't particularly want to sell it, we would be happy to donate it to a good home. We wanted an idea on its value, or more appropriately, it's rarity, because as you say if it is not common it would be worth preserving. If it happens to be a rarer model we'd rather see it go to a collector who would appreciate it.

Hopefully someone may read this post and be, or know of, a collector who may be interested.

Thanks