Vintage Surveiller La Bouille 'Pot Watcher' Disk

This is a vintage kitchen utensil known as a 'Pot Watcher,' designed to be placed at the bottom of a pot to prevent liquids like milk or pasta water from boiling over. The item consists of a small, white kiln-fired ceramic or heat-treated glass disk with a recessed center. The disk features an embossed decorative element in the center—likely a rooster or similar kitchen motif—and the words 'POT WATCHER' embossed around the inner rim. It is presented in its original retail packaging, which features a printed paper header card stapled to a clear plastic bag. The header card is titled 'POT WATCHER KEEPS POTS FROM BOILING OVER' and includes dual-language instructional text in English and French (Surveiller La Bouille), indicating Canadian manufacture. Physically, the disk appears roughly 2 to 2.5 inches in diameter. The packaging shows significant signs of age and wear; the paper header is yellowed with foxing, staining on the lower right corner, and multiple creases. There is a hole at the top where it was pinned to a surface. The plastic bag shows some clouding and internal debris. Despite the packaging wear, the ceramic disk appears intact without visible chips or cracks. Based on the typography and material style, this item likely dates from the 1960s to the 1980s.