No such factory designation.
Standard Catalog of Smith and Wesson, 3rd Edition.
The Standard Catalog of Smith and Wesson, 3rd Edition by Supica and Nahas has serial number data that will assist you.
Standard Catalog of Smith and Wesson, 3rd, edition
The Standard Catalog of Smith and Wesson, 3rd edition, by Supica and Nahas.
The Standard Catalog of Smith and Wesson, 3rd Edition by Supica and Nahas will give you plenty of information.
Call S&W or acquire a copy of the Standard Catalog of Smith and Wesson, 3rd edition
50-550 usd
According to The Standard Catalog of Smith & Wesson, 3rd Edition that s/n was manufactured in 1980.
Per The Standard Catalog of Smith & Wesson, 3rd Edition that s/n was manufactured in 1981.
The Standard Catalog of Smith and Wesson, 3rd Edition, by Supica and Nahas.
50 USD or so
You need to find a copy of The Standard Catalog of Smith and Wesson, 3rd edition by Supica and Nahas. The Model 29 and it's variants take up a couple of pages.