Have you tried typing: "royal winton" "sherry barrel" into Google? I have found out the value of many collectibles this way. Many dealers give retail prices. Check Ebay in case someone else is selling one and 'watch' the bids, noting how much it goes for. Take it to an antiques dealer and ask them how much they would pay you for it, then add 30-50 percent to calculate its retail value. Or get it properly valued by an expert for insurance purposes.