It is my understanding that the "TPL" does stand for "tropical" - indicating that the web fabric had been treated with a fungicide to inhibit growth of mildew and such in hot, wet conditions. That is what Clive Law states in "Inglis Diamond: The Canadian High Power Pistol" about the marking, which appears on many of the Canadian web holsters for that pistol which are relatively common on the collector market in "unissued" condition - it was expected that, following victory in Europe, Canadian troops would have to be transferred to the Pacific theater to help defeat Japan, and lots of gear was being stockpiled for that purpose. As things turned out, with the little surprise that the United States had up its sleeve, the war was over a lot quicker than it otherwise would have been ....granite said:I have an Enfield sling, tan colour, with a green clear paint or coating on the brass fittings, only marking is a large TPL on one end. Is this tropical issue?