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Non-electric detonator , made of aluminium.
The filling consisted of 9grams A.S.A and Tetryl.
This detonator replaced the

Photo on the right and the two below thanks to
Dave Sampson.

Mk I :
Length : 44,4mm
Diameter : 6,3mm

This container consists two halves, shut on both ends by two metal screw lids.
One side fitted 10 detonators and a bakelite rectifier which was used to clear the space for the detonator.
The other half had 15 detonators installed.

Total length : 120mm
Diameter : 72mm

Photos © Andrew Edgecombe.