Made by William Currie & Company, Eclipse Patent balls were produced under the third patent ever issued for a golf ball,  William Currie’s Dec 20, 1877 British Patent 4,838.  This patent covered including additives mixed into the gutta percha, such as ground cork,  ground leather, vetetable fibers, etc.   Currie made the Eclipse Patent ball for a number of years, into the 1890s.  This example shows moderate use.  A great ball with great history!