Bonds could be any age -- the minimum
was 4. Often, bottled whisky is even older than the stated age on the label.
In this case, the green strip stamp on which the barreling and bottling dates are printed will also tell you whether the seasons were fall or spring. You can do the math from there.
As others have pointed out, it's an interesting -- and likely very good -- bottling, but not terribly valuable except to those who enjoy fine bourbon (me, for instance
). Drink it.