VERTEX A SILVER HALF HUNTER POCKET WATCH the round white enamel dial having a subsidiary seconds

VERTEX A SILVER HALF HUNTER POCKET WATCH the round white enamel dial having a subsidiary seconds dial at VI o'clock, blued steel hands and signed 'Vertex', the movement having a lever escapement and stamped 'Vertex, MA, 17 Jewels', the inside of the case stamped with the hallmark for silver, Birmingham, along with the casemaker's name, case style and serial number, 'Dennison Watch Co, Special, 55038', the case with engine turned decoration and engraved Roman hour numerals to the outer cover, diameter 50mm.