Antique 18th Century American Revolutionary War Pennsylvania Rifleman's  Engraved Gun Powder Horn

Large antique, 18th century, American Revolutionary war period, Pennsylvania Dutch rifleman's powder horn (1770s-1780).
It is made of a hollowed-out brown horn with a domed oval wood base secured with brass tacks and fitted with a brass loop in the center for a suspension cord.
The body is engraved in the middle with the initials J.R.K. The upper part below the wooden base is engraved with typical 18th-century Pennsylvania Dutch Hex signs – a rosette for good luck and a Pennsylvania Hemlock twig.

CONDITION: In its original untouched condition. Free of repairs or restorations, with a superb mellow old patina. Some brass tacks are missing, and the wooden base retains the original red paint that this powder horn was painted in the 18th century.

MEASUREMENTS: Total length is approximately: 35 cm (13.78 inches).

REFERENCES: For similar examples, please see;
1)" Weapons of the American Revolution and accouterments" by Warner Moore.
2) "Collector's Illustrated Encyclopedia of the American Revolution" by George C. Neumann.
We will also provide the buyer with photocopies of the pages from the mentioned references and a certificate of authenticity.