Yellow Helmet Cassis Cornuta Shell Sale! from 14999 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Vintage Yellow Helmet Shell. Has slight damage in the form of chipping around edge, sold as is! Dimensions are approximately 12” length, 8” width, and 9” height. SKU: Rebecca SKU:REBECCA Tweet