Dating shotgun shells
The bottom with Western-format lot number NF 52 equates to 25 June 1958 and identifies Winchester as a division of Olin-Mathieson Chemical Corporation (1954 thru 1968).
1.3 Another Winchester 1946 style box with lot number 2G69 8, probably equating to 8 June 1949.
2.1 Example Boxes of Winchester military contract 30-06, headstamp is WRA (over) 53. Variations of this design were used from about 1928.
2.0 1961-1972 The Yellow Boxes Winchester's ammunition production relocated from New Haven, Connecticut, and merged with Western Cartridge Company in East Alton, Illinois, by 1958, and Winchester production adopted the Western lot numbering system thereafter.
At some point during this timeframe some 50-round pistol caliber trays changed from one-up-one-down open trays to white styrofoam.
It, too, contains a styrofoam tray holding WINCHESTER-headstamped cases.
Its lot number 16FA61 equates to line 16, 16 January 2012.