noun
hunting-case watch
A pocket watch with a metal lid that covers the crystal, often associated with antique or vintage timepieces.
祖父の遺品から両蓋時計が出てきた。
A hunting-case watch was found among my grandfather's belongings.
懐中時計 is a general term for pocket watches, while 両蓋時計 specifically refers to those with a protective lid over the face.
Compound of 両蓋 (りょうぶた, 'double lid') and 時計 (とけい, 'clock/watch'), describing the characteristic hinged cover.