Home – Horological Association of Virginia Horological Association of Virginia Check out our March 2025 HAV Convention information under Seminars Conventions Advancing the Art and Science of Timekeeping Since 1939 the Horological Association of Virginia HAV has been championing the interests of watchmakers clockmakers collectors enthusiasts and other professionals in the horological community. Who We Are Located throughout the Commonwealth of Virginia HAV has charted three local trade guilds which bring together fellow professionals hobbyists and enthusiasts for regular meetings and programs. With HAVs strong backing your local guild becomes your goto source for information and fellowship. Potomac Guild This largest guild draws its members from Northern Virginia the District of Columbia and Maryland.