1930s BLACK DIAMOND STRINGS Vintage BOX Mandolin G Or 4th Wound On Steel 759 National Musical String Co. 100% original. New Old Stock from former music store, never used. Includes 13 strings, each is individually wrapped inside their envelope. The strings may show age and possible corrosion and can be used however you like. Many people use these for case candy or display and others may string them up on their vintage instruments. Either way, these are sold as-is, where-is, with no guarantees implied. Includes original box in very good condition, writing under lid. Classic! SHIPPING BASED ON LOCATION. Please pay immediately after purchase. Be sure to check our other items!