Neumann Freres was in business in Liege, Belgium from 1863 until 1957. Thousands of their double-barrel shotguns were imported to the US (marked with English "Bros." instead of French "Freres") prior to WWI. Value to a shooter = $0, to a collector = $200 (but only if in as-new condition), to a decorator for a mantlepiece = $125-$150.
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the internet
Not enough information.
Contact Polards.
None published. Try shotgun collectors.
There's a whole shelf of books on firearms in your library. Or you may find information on www.savagearms.com
Look up the Marlin shotgun with the same model number.
You can find some of them on MySpace, and you could try to contact Warner Bros.
Have you tired the internet?
Impossible to answer without knowing who made it.
You can always go to wikipidea
Go here - http://www.wwgreener.com/