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.
look on the breach, barrel.
Try the receiver, barrel, forend
Check the receiver and barrel
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
The value of a Simmons Royal 16 gauge double barrel shotgun depends on a number of factors. Most important being the age and condition of the shotgun.
Please include the model number of your Winchester shotgun to get a correct answer to your question along with the serial number.
next to the barrel
Try loooking on the reciever, tang and barrel
27p