Another one to consider besides the jetscream,Fox40s and Acmes.
This one actually has synthetic peas that they claim won't absorb moisture and stick. I still think that pealess is the way to go, the less to go wrong the better.
the #772 model is the standard issue British perry whistle...the whistle lays flat,compact and of course pea-less..the other model shown looks just a little bulky...the perrys used to be very common in the Brit.imported B.C.B survival tins..i still have a few scatterd around in my kit....vince g. 11b inf..
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