From the early 1950s until about the time of the introduction of the outside plug 250 engines in 1959, Ferrari used the black Magneti Marelli B-7 design coils. These were slightly larger than the B-5s and again had the mounting bracket spot welded onto the cans. The whole assembly was painted satin finish black and the aluminumB-7 tags were attached to the bracket with two tiny “u-drive screws.” The usual practice was to cut off the ends of the aluminum tags, at a 45-degree angle, near the end of the lightning bolts and then attach them with one rivet on each tab. I have alos seen original pieces with full-length tabs and using two rivets on each tab. Blue aluminum Magneti Marelli B-7 coil tags.
This is a blue aluminum tag, “AEC 103A”, (40x100mm) used on the Dinoplex units on the Daytona coupes. It warns against loosening the battery cables when the engine is running. Blue AEC 103 A Dinoplex tag for Dayonas
The third type of air cleaners was the more conventional “Coffee Can” model. They used a satin black painted steel top and bottom with side panels made of louvered aluminum or perforated and nickel-plated steel. The earliest ones had the Weber information embossed in the top but this was soon replaced with a smooth top using the same Weber tag riveted to the top. Early “Coffee Can” top Weber tag.