This was done so that the currency could be declared worthless in case of Japanese invasion.

It was not scrip that could be revoked or declared worthless.

Undeposited money after October was declared worthless.

In the event that Hawaii was captured by enemy forces, the special notes could be declared worthless.

These notes had a distinctive yellow treasury seal, which would again allow them to be declared worthless if large amounts fell into enemy hands.

The Dutch closed the bank in 1818 giving people six months to exchange their banknotes before they were declared worthless.

Both of these types of notes could be declared worthless if they fell into enemy hands.

The old issue was declared worthless, and all notes collected were burned.

This was done so that the currency could be declared worthless if there was a Japanese invasion.

These notes, too, could be declared worthless if seized by the enemy.