37mm crimp

[Collector56]

Hi everyone, recently picked up this WW1 dated 37mm cartridge, it was the style of crimp that caught my eye, it is a heavy groove which goes right round the full circumference instead of the usual few small indentations
Could this be a factory production or perhaps produced in a home workshop
Any opinions appreciated.

 

[highlandotter]

With the appearance of automatic guns, crimps became more important than for single shot or revolving guns, This round could have been made for Maxim auto gun. Date is right.

 

[Gspragge]

A bit unusual for German having an all round crimp. But the Otter is correct in belt fed guns there was always the chance
of the projectile staying behind in the belt so a better crimp was needed. In loose fed weapons it was just a matter of the thing
staying together in transit.

 

[bacarnal]

In addition, in Mellichamps second book he has this round as a Krupp Lichtspur mit brandwirkung with a reduced/narrower band from the Lichtspurgrenate, and using the 94mm 119A casing crimped 6mm below the rotating band (pages 415&416, which this one is). They sometimes also used the Sokel flak's 917 101mm casing (page 505).

 

[Collector56]

Thank you for the information, I suspected it may have been a home made job, good to know it is possibly an original variation.
Thank again to everyone for sharing their knowlege