Penny for the guy. We didn't go trick or treating when I was a kid but we did collect money & sweets doing this for Bonfire Night - Remember Remember the of November (firework night), Guy Fawkes and the gunpowder plot at the Houses of Parliament ;
On the subject of I-Spy books, here is a display stand containing all the titles I remember from childhood. It includes the Membership Pack that I remember so well, that contained a badge and a codes booklet.
Image result for tomahawk bicycle
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