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?

L. C. Smith 10 gauge brass shot shell loading - The DoubleGun BBS @

410 Over Pressure Part 2 - Mystery Solved w/pictures

Why do shotgun shells have brass or steel encasing the base while the rest of the shell is composed of paper or plastic? Is it necessary? - Quora

Handloading, Military Wiki

12 gauge shell Identification

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Short (Mini) Shotgun Shells - Cooking With Gas Now

What was the point of brass shotgun shells, and are they still used? - Quora

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DADDY AMMO Full Metal 20 Gauge Shotgun Reloader – Shotshell Handloading Roll Crimper, Gunsmithing Tools - Canada

CBC Tropical - General Ammunition Discussion - International Ammunition Association Web Forum

Should I sell or keep the brass from my bullet casings? - Quora

Voenohot Star-Shape Shotshell Reloading Press Crimp 12 Gauage, Gunsmithing Tools - Canada