Model Number: Schmid Model 75 Silver Plated Inner Diameter: 17.5mm Throat Diameter: 3.9mm Cup Shape: U-Cup Shank: American Purchased about 3 months ago. Hardly used. I bought it for high notes because of the shallow cup, but it doesn't suit me, so I'm selling it. *The box is torn, so the body will be wrapped in bubble wrap for shipping.