The 250 series cars built by PininFarina often used a special type of hose clamps on the large air duct hoses. These clamps are called “Diament” based on the manufacturer’s logo which is sometimes found on the body of the clamp. These clamps are very similar to the normal Copiglia clamps but they have a special body with a small set screw which is used to secure the strap once the clamp is tightened. I have seen these on P.F. Coupes, Series 1 Spyders, G.T. E.s and the Cabriolets. Unstamped Diament Clamps for 250 P.F. cars.