Alpacca white metal 'pop-up' cigarette case, decorated both sides with embossed racquets and balls, circa 1920's the upward pressure on the base opens

Alpacca white metal 'pop-up' cigarette case, decorated both sides with embossed racquets and balls, circa 1920's the upward pressure on the base opens the twin hinged flaps at the top raising the cigarettes into view, marks Alpacca, weight: 83.3 gr., 9 by 6.5cm., good condition