The very earliest cars used the Magneti Marelli B-5 coils. These coils were black and had the mounting bracket spot welded onto the black metal can. The B-5s had a small vertical slot on each side of the mounting bracket. The end tabs of the aluminum tags were inserted into the slots on the mounting brackets. Rivets were not used on these tags. These coils were used on only the earliest cars in the late 1940s and early 1950s. Etched Magneti Marelli B-5 coil tags.
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.