Ham Key HK-4 (Paddle/Key Combination) made by Ham Radio Center, Inc. St. Louis, Missouri, USA
Ham-Key was an Amateur Radio telegraph key manufacturer in the 60's and 70's.
This Ham-Key paddle and straight key on one gray hammertone base. These were produced and sold by Ham Radio Center of Saint Louis, MO and are no longer in production.
They were sold as a cheaper alternative to the more expensive Brown Brothers products.