sanddaddy, welcome to the forum. From what you say it does sound like the sideplate seam. If you look at the gun from the rear you will see the seam on the right side of the hammer. And, looking at the right side of the gun, it will follow the contour of the recoil shield up towards the top of the gun, and then turn towards the hammer. A crack, where you are describing it, is relatively unusual.
Post pics, we'll let you know. A lot of people have seen that seam and thought, "Oh No!", so you would not be the first!
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