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Thank you!The 4th Edition of the Standard Catalog of S&W puts 3D serial numbers at 1978.
1978 is correct. But actually, the 4th Edition contains a typo on page 490, with no mention at all of the 3D numbers. This has been corrected in the 5th Edition. All 3D numbers were assigned in 1978.The 4th Edition of the Standard Catalog of S&W puts 3D serial numbers at 1978.