Scriber
Sturdy, black plastic scriber used as aide to relate measurements while cutting window mattes for artwork.
https://m.media-amazon.com/images/I/81TcoE1V09L._AC_SL1500_.jpg
https://m.media-amazon.com/images/I/41bqzJC7UJL._AC_.jpg
https://m.media-amazon.com/images/I/41bqzJC7UJL._AC_US40_.jpg
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X-ACTO
{"Manufacturer": "X-ACTO", "Date First Available": "December 19, 2010"}