Sea Shell Spondylus Regius?

I have quite an extensive sea shell collection that I am selling. I don't know the names of them but I do know they were not cheap and I collected them a long time ago so they are probably even more valuable now. This one is 3 1/2" x 4" without the spikes. T is a hinge and it will stay open if you want to display it that way. I invite you to see my store for the rest of the collection. Thank you so much for your interest.......