As no. 319, [III C 9884] but with long, thin iron nails for fastening the membrane. All strings made of nylon material, four of them from a twisted pair of nylon strings. As extensions to the lower tailpiece, double-tensioned nylon connections. Another one between the tailpiece and the tip of the bridge. A large, round calabash opening. No retaining cord. from Ulrich Wegner: African stringed instruments, Staatliche Museen Berlin - SPK, 1984 (Appendix object catalogue)