I will get a photo tomorrow .It has a pattern now but the seam is about 1 inch wide all the length of the barrelDepending on the value just polish a small section of the underside and apply a weak acid, even vinegar, if a pattern shows up it’s Damascus if nothing then it’s plain iron or steel.
Generally fake damascus will have a plainer pattern than the real thing, but not always.
Can you post a photo?