Herm Sprenger Swan Neck Spur with knob end in German Silver. Neck is 40mm (1 5/8"). Unisex. Herm Sprenger part # 47 075 000 40. A bit of general information about Sprenger: Since it was founded by Hermann Sprenger in 1872, Herm Sprenger GmbH has been a family owned company that produces top of the line equestrian products used by top riders around the world. All Sprenger products with the famous HS logo are manufactured in Iselohn Germany using the finest materials available to exacting specifications. When only the best will do, Sprenger products are the obvious choice!