Thanks again for you comments. I guess I'm just trying to get as much info as possible and you guys have been very helpful. I know it sounds like I'm dithering but unlike your part of the world vintage US kits are a pretty rare find here and another opportunity to buy a (albeit project) vintage Ludwig may not come around again for a long time. But, having said that, because they're so rare here I think you can understand my questioning of its authenticity. Obviously at the sort of price I discussed earlier it's a no brainer but I suspect, in the end, it won't be cheap.
I'm thinking it's worth a punt though.
Thanks