Watch List notes:

Large stone cannonball with rusted spike, 1500s. 6980 grams, 6" diameter. Far less common than iron or even bronze cannonballs, this example made of stone was found off the coast of Dover, in the area of Spanish Armada battles, with the remains of a rusted spike (which were used to create incendiary projectiles in sea battles) peeking out, completely intact and mostly smooth surfaces. With photo-certificate.
(400 - 600 USD)