The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Cuneo24: "Il 20 aprile 1964, infatti, dallo stabilimento Ferrero[3] di Alba uscì il primo vasetto di Nutella[2]".
Nutella's own timeline: 1946 Giandujot, 1951 SuperCrema, 1964 the recipe improved and the first jar of Nutella created, 1965 Germany, 1966 France.
Ferrero: Pietro Ferrero's original recipe answered post-war cocoa shortages with Piedmont hazelnuts; in 1964 Michele Ferrero evolved it into Nutella[2].
Also dates the first jar to 20 April 1964 at Ferrero's[3] Alba works; Giandujot 1946, Supercrema 1951, Michele Ferrero's 1963 decision to rework brand and recipe, sales in Germany the next year.
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