A barrel which is fashioned by hammering 2 strips of metal together around a mandrel. They were expensive when they were in vogue 125 years ago but they are weak and unwanted now.
No.
A damascus barrel is a barrel made of damascus steel, which is steel produced by hammering two different steels together. The twist refers to the pieces of steel being twisted while they are hammered, which produces the distinctive pattern on the steel.
Damascus barrel (in French).
You don't.
Not.
Damascus is a type of steel used usually of older firearms and tools
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
Impossible to answer without knowing make and model.
it is all swirly
Yes.
Needs to be examined by a gunsmith
I need the answer