Brass Shotshell Crimp - General Ammunition Discussion

What would be correct name & time frame for the type of crimp on this Winchester 10 ga brass shotshell?

US 410-12M/M ALL BRASS headstamped shot shell - General Ammunition Discussion - International Ammunition Association Web Forum

Cartridge (firearms) - Wikipedia

Ammunition 101: The Basics Of A Cartridge

Cast performance 405 load development.

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410 Over Pressure Part 2 - Mystery Solved w/pictures

Reloading: Reclaiming Brass - The Shooter's Log

CBC UNPRIMED BRASS SHOTSHELL CASES - 16 GA (SPLIT BOX 24 CASES) - 1967spud Reloading Supplies Ltd

Why does it seem like much more often than not when Hollywood shows a shotgun being loaded, it's with a low brass round? What gives? - Quora

Federal High Over All Competition Target Load Shotshells