Hello karl...
As said, no tellin' but probably someone screwed a 58 barrel onto a 57 frame for some reason... A good gunsmith would be able to fix your front sight problem. Pop out the pin holding in the front sight and then make a new sight blade of the correct height... Not easy but a good smith can do it. I've seen some 58s converted to .45 Colt that had a custom front sight blade becasue the Colt uses a heavier slower bullet and will usually shoot higher than a .41...
Bob
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