Semi-Rimmed 1.59in Crayford Round - 1918.

[oldshotandshell]

Bit of an odd one here, a 1918 semi-rimmed 1.59in Crayford Common Pointed round. Dimensions as per a standard Crayford round but case is semi-rimmed not rimmed. The base of the projectile is still crimped into the case. 1918 dated and no Lot number. Any information appreciated...

 

[SG500]

Ah another one pops up out of the woodwork.
I used to have one, see this link below (I incorrectly referred to it a rimless).
Dave.

http://www.bocn.co.uk/vbforum/threads/29759-Crayford-queries?highlight=crayford

 

[Tony Williams]

So, the change to semi-rimmed was presumably to make it more suitable for use in an automatic gun. Anyone know anything about it?

I am reminded of the 1 pdr COW gun round, which (IIRC) was basically a rimless version of the standard Maxim pom-pom round (dropped in favour of the 1.5 pdr)