In recent years we have been testing and experimenting with shell wind instruments,  inspired by the archaeological record.   Our first replica of the 18,000 year old Marsoulas Cave artifact from France was a success, so we started looking into Mesoamerica and the Pacific cultures as well.    This replica was inspired by some of the archaeology and ethnographic writings/drawings of Mesoamerican cultures using Welk and Queen conch shells for instruments/trumpets during ceremonial events and processions.  Our research lead to the cutting of the mouthpiece and drilling of small hole into first chamber from the apex, and results in a horn sound(hear video above). This example measures 10 inches long, and has a drilled hole for the mouth piece.  This example turned out exceptionally well, is has one of the best sounds we have been able to produce here.  The video above is the shell being sold here. This is a real and natural shell, with no cracks or holes as a wonderful example. .