The “Clam Shell” type jacks were supplied with the “inside plug” 250 series cars. A drawing of these jacks can be seen on page 256 of Richard Merritt’s book Ferrari: Operating, Maintenance, and Service Handbooks 1948-1963. The jacks had an A. Rejna metal tag riveted to the top casting. The original tags were either red or green. Red A. Rejna jack manufacturer’s tag.