A treaty is an agreement between nations. There are several treaties addressing trademark rights.
Some treaties attempt to harmonize the laws between countries, while others set up a centralized trademark registration filing system. The usefulness of a treaty depends in part on whether the treaty invokesnational treatment or reciprocal rights.
One of the most important treaty rights for new trademark registrants is reciprocal filing rights. This right allows US trademark registrants to receive the priority in other countries of their trademark registration date in the US if they file for registration in the member country within a six month period following filing in the US.