Looking at the cost of replicas, yes it's worth something:
Looks around 1930's
http://www.dyers-rolls-royce-bentley...9df1c0e9f60130
or similar type originals
http://www.jimpike.co.uk/id24.html
Search for (radiator) mascots not badges.
http://cgi.ebay.co.uk/Rare-Bentley-F...QQcmdZViewItem
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