Depending on when the accessory kit pieces were gathered and packaged for sale, three different "COBRA" emblems were used in sequence. I have personally seen these three versions used in kits Ford sold.
"S1CS-19523-B Emblem, AC_Cobra 2 9/16", in this case the second of two versions used in new Cobras and the first for two versions sold as service replacements and accessories until Shelby's California works stopped selling parts.
The "S1CS-19523-C Emblem, AC_Cobra" part was used in new Cobras CSX2133-CSX2589 and sold as an accessory while supplies lasted. Shelby American arranged for this part to be made.
The "Ford C3RA-14225-A 2" part was used in 427 Cobras and sold in large quantities as separate parts and in accessory kits. Ford Motor Company had these parts produced. The C3RA-14225-A part became the service replacement for the S1CS-C part circa 1966 and later the replacement for the S1C-B part also for all Cobras and 427 Cobras.
"S1CS-19523-B Emblem, AC_Cobra 2 9/16", in this case the second of two versions used in new Cobras and the first for two versions sold as service replacements and accessories until Shelby's California works stopped selling parts.
The "S1CS-19523-C Emblem, AC_Cobra" part was used in new Cobras CSX2133-CSX2589 and sold as an accessory while supplies lasted. Shelby American arranged for this part to be made.
The "Ford C3RA-14225-A 2" part was used in 427 Cobras and sold in large quantities as separate parts and in accessory kits. Ford Motor Company had these parts produced. The C3RA-14225-A part became the service replacement for the S1CS-C part circa 1966 and later the replacement for the S1C-B part also for all Cobras and 427 Cobras.