Hi Wayward,
This is his Auction estimate, but he may be a wee bit off, although he's probably got access to all the Auction Hammer Prices. However, he will be thinking what it might fetch at his Auction House, despite being hooked up to the internet. The other two Auction Houses I've contacted have specialist Fine Art Auctions, and I have a feeling they might come up with a slightly higher estimate.
I'll let you know what replies I get ... whatever .... I'll still be content
I'll try sending pics of the other one as well, if it is by someone famous then I'm sure they'll recognise the style ... but without a signature