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Neck coil On glass vessels, a neck coil is a decorative, most often thick, glass trail around the neck of a vessel, which was common on the glassware made in the East in the 4th century.	Neck coil On glass vessels, a neck coil is a decorative, most often thick, glass trail around the neck of a vessel, which was common on the glassware made in the East in the 4th century.