Yes sir, it is a .357 magnum. Unless something is drastically amiss the caliber is marked on the right side of the barrel. Your original post doesn't provide a barrel length. The common ones are 2.5", 4" and 6". The more knowledgeable can expound on which length will garner a premium price. It's usually the shorter more concealable. After it's inception the Model 19 was a workhorse for law enforcement mostly in the 4" variety. Blue or Nickel also makes a difference. Hope this helps, hardcase60

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