
A marine cargo insurance policy issued to cover various unspecified exports over the life of the policy.
Found on
http://www.duke.edu/~charvey/Classes/wpg/bfgloso.htm

A cargo policy with no expiration date that provides automatic coverage of cargo to or from an Assured in a specified trade at agreed rates, terms, and conditions. Usually consists of separate Marine and War policies. An open policy is one in which the amount of the interest of the insured is not fixed by the policy, and is to be ascertained in c.....
Found on
http://www.lectlaw.com/def2/o018.htm

a continuous policy covering goods of a class subject to changes in volume, usually requiring periodic reports of values.
Found on
https://www.infoplease.com/dictionary/open-policy
No exact match found.