This is an aluminum tag with a black overlay. These tags were mounted on the top of the timing chain housing on all of the V-12 engines until the 275 GTB 4 cams when they were attached to the top, rear of the air cleaner. On the 330s the tags were moved to the top, front of the left side valve cover. These tags are mounted on the aluminum castings with small “U-drive” rivets and to the 275GTB/4s with the hand bucked round head rivets. V-12 Firing Order Tags with correct rivets
In the early 1950s the “street” cars used three of the two-barrel Weber carburetors. The air cleaner assemblies were supplied by F.I.S.P.A with a small aluminum F.I.S.P.A tag riveted to the tops. Two-Barrel early regtangular F.I.S.P.A air cleaner tag.
The next generation of tags was crescent shaped with a blue field and black writing. These were introduced in the mid-1950s and were used on both the individual coffee can type filters and the new “Three-in-One” type air cleaners which had a single long housing that contained all three individual filter elements. These tags had a chord length between the rivets of 51mm. Early F.I.S.P.A blue and black crescent shaped tags with the 51mm chord length.