Tri Pukli
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"Tri Pukli" (ТРИ ПУКЛИ) is Russian for "three rivets" and you can see how they earned this nickname in the second picture above, showing how one end of the heelstrap was fastened to a buckle on one side while the other end was permanently fixed to the fin with three rivets. Once again, shoelaces were used to improve fit when the fins were worn over a drysuit. These fins were originally developed for military purposes and were manufactured at a rubber plant in Yaroslavl, north east of Moscow.
Here is one description of the fins from a Soviet diving book: "Popularly known as ‘ТРИ ПУКЛИ’ (three rivets), the fins are intended for scuba diving. They are made of dark green flexible rubber with two lateral ribs for reinforcement. The fins are trapezoid in shape. The foot pockets are wedge-shaped. The fin has lacing on the top. The heel strap is adjustable, fixed to the base of the fin on one side and attached with a buckle to the other. In later years, the heel strap has a reinforcement in steel with three rivets. The fins come in three sizes."
In my next Soviet Fins thread, I'll move on to five fin models made during the 1960s and 1970s in the "second city" of the USSR, Leningrad, now known as St Petersburg.