GS Emblem ID Assist Needed

1384620 which I believe may be the casting number

70-72 Fender emblems perhaps

 

I'd say 70 - 72 front fender

 

You are both correct. 1384620 is the casting number and it does go on the front fender.
The actual P/N is 1394199 and it came as a kit (the GS plate and the attaching hardware).
That P/N was used on the 68 3437 - 4600 Models and 70 - 72 3437 - 67 - 4600 - 9000 Exc GSX