Keystone firearms were made by the Davenport Firearms Co. in the late 1800's. They were, I believe, inexpensive guns made to be sold either by mail order or through your local hardware store. Unless it is in very very good condition it value would probably not be more than $150 or so, and then only to be used as a wall hanger. One should be very careful about firing any damascus barreled gun, this is especially so with inexpensive firearms from that era.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
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A Damascus twist steel double barrel shotgun is an antique shotgun made by layering iron and steel and welding them together. This kind of shotgun is worth approximately $3,000 depending on the condition of the weapon.
around $6000
10-100 usd
Under $200.
about $3500
The value of an old double barrel shotgun Damascus Bonehill Special BB London would actually be dependent upon a number of factors. Some of these factors would include the age exactly and the condition of the shotgun.
$317
Have it examined by a competent gunsmith
50-100 USD
I just bought a H.S. Brown Damascus double barrel in 10ga. Dated 1883 in very good condition for $400.