This specimen has six narrow ribs on the tapered cone. The brass Schenkl
percussion fuze was patented by John P. Schenkl on October 15, 1861, patent #33,495.
However, stamped on this specimen's fuze is "J.P. SCHENKL PAT. OCT. 16, 1861".
An improved model was patented by John P. Schenkl on August 19, 1862, patent #36,236.
