Models 27, 29, 57 and other N Target frames are identical. There have been numerous reports of revolvers with mis-marked model numbers as a result. Regardless, by definition a .44 Magnum carbon steel S&W N-Frame revolver manufactured after ca. 1957 is a Model 29, regardless of the model number stamped in the yoke cut.
As pointed out it is possible an original Model 57 may have had the barrel and cylinder replaced with those from a .44 Magnum. In this case it would be a converted Model 57.
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Gunsmithing since 1961
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