This horn nock was found in a concretion in 1997, and is the only surviving example on the Mary Rose.
Nocks were used to attach the bowstring to the tips of a longbow.
All of our longbows have a discoloured section at the tip, which has been suggested was caused by these nocks being in situ during burial. The nock is made of cow horn, a material prone to parasitical decomposition, which would explain why so few survived on the seabed.