Each recipe is indicated by a code—O means the Four Roses distillery; B or E indicates the mashbill (B is 35 percent rye, E is 20 percent rye); S means straight whiskey; and the last letter specifies the yeast strain, each of which brings a different flavor profile to the whiskey.
—
Jonah Flicker,
Robb Report,
19 Aug. 2025
Ryan Christoffel at 9to5Mac has useful analysis that specifies what happened when in recent years to help specify the release date.
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