A gentleman's stainless steel chronograph wristwatch, 1940's,

細節
A gentleman's stainless steel chronograph wristwatch, 1940's,
black dial with telemetric, tachymetric and spiral scales, subsidiary constant seconds and 30-minute recording dials, 17-jewel nickel finished movement, case with polished bezel inscribed with Arabic numerals, snap on back, dial, movement and case signed, diameter 37mm.