I had thought it may have been just straightened out initially, but mine has an obvious 4 inch (fuller?) groove stamped into both top and bottom of the rear handle. I don't have any clear photos of a curled handle model to compare if they have this as well. Or, I could have a standard 624 but the previous owner had some wicked forging skills? By chance does anyone have a standard model with the curved handle that can take a peek at theirs?