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Check under the forearm
Watertable, forearm metal, and barrels
Take the forearm off, it's usually on the bottom of the barrels.
Check the top of the receiver and under the forearm.
Forearm iron and watertable are the easiest places to obtain this info
It won't have one. There may be some numbers under the barrel on the forearm, but they will not be serial numbers.
If it is a Side by Side like my Western Long Range Gun, pop off the forearm - mine is marked in three places: the wood of the forearm, the metal of the forearm, and on the action. My Model 37 has the serial number stamped on the front of the reciever, opposite the slide for the pump. It is in the area between the magazine tube and the barrell.
Euro made. Get an appraisal
Serial numbers were not required before 1968. If it has one, check under the forearm, on the barrel and on the action.
There is no reason. Therefore, fourteen is a whole number.
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.
Before they were required to be clearly visible on the receiver, one may have been on the lower tang (behind the trigger) or under the forearm, either on the forearm or the bottom of the barrel. Since these guns were made many years before serial numbers were required, there may not be one.