Nice historic records. Not sure about the 2 dates on the form as the sailing date is more than 2 months before August 81. Was the shipping load covered by the insurance?
Nice pick up ! The three other Insurance forms have the same dates - 1/8/1981. The first vessel sailed 15/5/81, the second 22/7/1981 and 11/7/1981. But the insurance forms are all dated 1/8/1981.
This is only the Insurance, not the value of the commercial Invoice.