From what I can find they are selling at auction for between $1200 and $1900 for most models.
Check the barrel and receiver
You may have to break the shotgun down in to the barrel section and the receiver section first.Look under the barrel section on the flat just ahead of the lug for the serial number.
There should be a stamped model number on the left side of your barrel. The serial number will be on the reciever; however, the model number is on the barrel.
Try the receiver, barrel, forend
Check the receiver and barrel
look on the breach, barrel.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
next to the barrel
Check the frame and barrel
Look on the receiver and barrel.
27p
not sure