Here is a photo depicting some types of caliber .60 cartridges (I assume API, ball, incendiary and APIT, if the codes are the same as for .50 caliber).
The cartridges pictured are not pristine because the illustration belongs to a visual inspection standards manual, where only defective samples are included.
Here are some headstamps. Note that according to this book, double primer crimping is as much a defect as a crimping lacking one stake. I don’t know if in other cases/countries double crimping may be done purposely.
I have in my collection only a ball (F A 48) and a dummy with a steel bullet (F A 45). None of them have any star in their headstamps.