Those are the waxless backcountry version, really cool.
Yes, good thing too, as that sinew wax is really hard to find these days. If anyone cares, the slowshoes are a 1952 "pickerel nose" style made by Snocraft Inc. in Norway, Maine. Mine have "U.S." stamped on them, which confirms they were military issue. According to the Internet, they were made for use in the Korean War. The two pairs I obtained came through a surplus jobber who bought the contents of a container that was discovered on a base in Nevada. They were like new when I got them 20 years ago, though the leather bindings had deteriorated to the point of being unusable.