H4 Hamilton Railroad Chronograph. Reference H40616535. Watch measures a cool 46mm and is made from steel. Automatic Hamilton movement base caliber ETA A07/11. Sapphire crystals on both sides of the case. Waterproof 10ATM or 100 meters. Functions are hours, minutes, sub seconds, chronograph and (magnified) date. A tachymeter scale is present on the dial. This watch is fitted with the original leather strap with steel double folding clasp. Naturally this watch is complete with the original box and papers dated August 2015. Please be aware that this watch was serviced and polished and is in a like new condition again. Super watch for the wider wrist!