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WWII S.O.E.TIME PENCILS IN BOX
Special Operations Executive
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Time pencils were fuzes timed by acid corroding a thin wire , when the wire broke a spring foced a pin onto a percussion cap exploding a small charge.
Timing could be erratic in different temperatures, a colour code denoted the time period of each fuze. Used mainley by resistance movements in various Countries.
The items shown are colour time code Green.