The lower half of the trademark. According to the query on the Penfolds official website, the Penfolds production date is in the lower half of the trademark on the bottle, and the production date code is also encoded in a certain way. Here, we can divide the last 6 digits into two parts for analysis: year and Date code. Among them, the numbers corresponding to the years range from A to K. For example, A represents 1984, B represents 1985, and K represents 1996. The date code is a number from 1 to 366, representing the first day to the last day of the year. Combining these two numbers gives you the date the bottle was produced.