Conch Sea shell - Charonia (No reserve price)

Natural seashells of marine origin, from a family heirloom. They date from the late 19th to the early 20th century.
One of them is 29 cm long, 14 cm high and 18 cm wide.
The other, smaller, is 23 cm long, 14 cm high and 15 cm wide. In this one, at some point a hole was made to use it as a lamp.