Definitely not S&W. Probably the product of a generic grip manufacturer who doesn't even have a brand identity to put on his product. I can pretty much guarantee that the ivory is not real.

The grips are not unattractive, but they are not original equipment for your revolver. At the time your gun shipped (late '50s, very early '60s), it would have come from the factory with diamond magnas.

BTW, welcome to the forum.

EDITED TO ADD: The previous post makes a good suggestion. I didn't even think about Jay Scott grips, but that's a possibility. I don't know how those were labeled or identified on the back. Perhaps someone else can address that question.

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David Wilson