OLD shot gun

Question
What, or how would I find out the date of production and value of a ST. Lutzelberger A Suhl  double barrel muzzle-loading percussion caped shot gun, one of the barrels is round the other is octagon. Their are stamped numbers on the bottom of the barrels as followed 1456, their is scroll work on the top as well as on the stock,on the side of the stock behind the cap hammers their is the word "RICHARDS" if there is anyone out their that can help shed so light on this for me that would be of great help? thank you !
I have tried the internet and it is like this gun was never made that or i just dont know what i am doing.

Answer
Hello Craig.
  I would like to throw some facts and possibilities, about your shotgun, your way.
1. It was manufactured in Suhl, Germany
2. I researched the Lutzelberger name and it is Germanic
3. The percussion cap was introduced ( not invented ) around 1830
4. One round barrel and one octagonal is generally representative of a combination rifle and
  shotgun ( although both barrels may be smooth bore, the rifle barrel is thicker to handle
  the higher pressures of a rifle ball ).
5. The name 'Richards' was used on some shotguns manufactured in Germany
6. There were many gun manufacturers in Suhl Germany during the years of the percussion cap
  muzzle loading firearms
 These are facts.
It is possible that the name 'Lutzelberger' was the gunsmith who actually manufactured your shotgun. I do not know why the name 'Richards' would be included on this shotgun. Wesley Richards founded his firearms business in London in 1812. He never had a gun shop in Germany.
  As far as a value, I would suggest searching for a firearms appraisal company. You might check www.gun-appraisals.com.
  I hope this will help you find what you need. Charles Gage