It has a few number stamped on it. The item on the bottom is a suspender clip for size comparison I guess.
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garyf said:It's a hot lead typesetting matrix ("mat") probably from an old Linotype machine. It was a type of "mold" containing one character. The Linotype machine had a keyboard and as the operator pressed the keys, the mats would fall onto a rack. When a line of type was completed, the machine injected melted lead to form the line. The lead lines were then assembled into a form which was then used in the printing process. Commercial printers and newspapers used these machines.