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The value of a 1905 model D single barrel choke bored Diamond Arms shotgun is actually dependent upon a number of things. Most importantly the condition of the shotgun.
nitro hunter shotgun single barrel with exposed hammer stamped belknap hdwre and mfg serial 5516
Please add the serial, but it is likely a single barrel trap gun such as the BT99
when did spring make 12g single barrel shotgun serial number 30368
50-100 USD
50-100 or so
Is this shotgun manufactured with a twist steel barrel
$35-$90, depending on condition.
Single barrel, under $100. Double-barrel up to $200 unless heavily ornamented.
Many early ones may not have a serial number. If they do, it will most likely be on the side of the receiver. There is a small chance it will be inside, after you remove the barrel.
About $50-$75 as a mantle decoration.