No safety blocks or wires. Shells were either percussion fired or fused. A fuse consisted of a cardboard tube with molded powder like a bottle rocket. This was cut and installed just before firing and depended on the flame from the firing to light it. These are found more often than the percussion fired ones because many times the fuse wasn't ignited. Modern explosions of CW shells is usually from someone cutting into or drilling them causing too much heat or sparks.
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