The barrel and clicker mechanism are identical to the Slim Jim but without the slotted knob which would hold the slip cap in place.
I suspect the simple button cap on the Slim Jim (like on modern ballpoints) came later and was a cost save.
So, now I've gone from being content in having a curious oddity in my collection to being on the hunt for a CA Retractable cap. Thanks .
Let me know if you have any spare caps!
Jim.
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