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I have seen this whistle you speak of. I do not know if they are manufactured anymore. If I recall, our association members had some interest in them a couple years back and when we looked into it I believe we discovered they were discontinued. Maybe not though. The official I know that used it really liked it as opposed to switching whistles in and out of pockets, using a rubber band or wrist band switching between wrists etc.
Personally I use an old plastic sock hanger that slips right over the waist line of my pants and I just can slide it from side to side unnoticed.
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