The later 275 and 330 desings reverted to the crescent-shaped aluminum tags as had been used on the earlier inside-plug 250 cars. The filter element number that is stamped in the “Tipo” block on the tags has changed from “AT4094” on the inside plug 250s to “2228.01” for the 275/330s. 275/330 crescent-shaped air cleaner tag.
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.