Yellow metal round case number 3770 with a cover back and front and a yellow metal chain. White face with numbers and a small second face at the bottom.. Markings inside the lid are BB. S. CROWN 18 ON THE REAR COVER. B. A crown. Triangle with 3 marks. 3770 Watch weighs 104 grams. With chain 148 grams
Bought by Brother in law. Unknown date