How are the die cracks on these mass produced Morgan's tracked? Do they have VAM numbers, or are die crack states assigned another catalogue code?
There is a Die crack guide for 21' Morgan's to help attribute them. The dies were horrendous this particular year.
Yeah, they were rushing to make them and quality control apparently took a back seat to mass production. But, I like the die cracks as they make each coin slightly unique (and cracking is often associated with a scarcer VAM - once any die crack progressed far enough, they would have retired the die for safety reasons or to eliminate cuds).
They aren't primary diagnostics for VAMs in general, but make good fingerprints that let you confirm an attribution, and for 1921 and 1921-D there are VAMWorld pages that diagram them for quick identification. Why? Because someone wanted to. I looked through this page and found what looks like a match to VAM 75A pretty quickly. Keep in mind that cracks grow over time, so any given coin might not have all the cracks shown, or it might have more.
Leroy Van Allen and A. George Mallis. They're the two gentlemen who first collaborated on what is now known as the VAM book back in the 1960s. Mallis passed away in December 1999. Leroy Van Allen is 86.