Ca. Ø43mm, silver case with hinged back, No. 511807, Swiss lever movement, intermediate wheel chronograph, very beautiful enamel dial, pink tachymeter scale, 30-minute counter, pink gold hands, military textile strap with steel buckle,pletely unrestored, movement starts ticking but needs service, rare. With the import Hallmark 1911, this watch is one of the first wrist chronographs!