LONGINES, Men's pocket watch

silver envelope, circular, on the inner side a circular hallmark with a winged hourglass and an inscription in the rim: E [rnest] F [rancillon] Co LONGINES;
below, the silver samples ("84", "875") and the model's factory number;
on the inner lid an image of numerous gold and silver medals and an inscription: "LONGINES / 7 / GRANDS PRIX / On one of the gold medals the date: "1900".
The dial with white enamel and Arabic numerals; at the top the inscription: "Longines"; at the bottom, a seconds hand dial;
Switzerland, early 20th c.;
mechanism to be restored