Special Duties Dead Letter Drop

SD Dead letter drops - replica
SD Dead letter drops (replica)
SD Dead Letter Drop in bolt
SD Dead Letter Drop in bolt
SD Dead Letter Drop in bolt 2
SD Dead Letter Drop in bolt (2)
SD Dead Letter Drop in gate bolt
SD Dead Letter Drop in gate bolt
Gate post Dead Letter Drop ref IWM
Gate post Dead Letter Drop -ref IWM (original)
Oxo tin message drop
Oxo tin message drop
Split tennis ball message drop
Split tennis ball message drop
Tennis ball message drop
Tennis ball message drop

Messages from runners to wireless operators were left in secret hiding places. Images are of replicas but known to be used were split tennis balls, hollow keys and hollow bolts where the head unscrewed.

At known location used a hollow gate hinge bolt.

References

Martyn Allen