The 7x64 was never a S&W cataloged item. I do recall seeing them advertised in Shotgun News from various distributors after S&W dropped their long gun line after 1984.

The 16xxx model/order number was used from 1981-1983, for 1984 the new order numbers were 273xxx for the 1500 Deluxe models.

Your Serial No. PN72583 is higher than the serial numbers of two of my rifles that were introduced in 1984.

Clear as mud, but my best guess for year of manufacture would be 1984.

KO