1900 antique gun metal chronograph pocket watch by Edouard Heuer.

E Heuer & Co was founded in Saint-Imier, Switzerland in 1860. In 1985, the TAG group purchased a majority stake in the company thus forming TAG Heuer.

This particular watch has a high-grade 19 ligne chronograph movement, identified as being manufactured by Edouard Heuer, which is working nicely. The movement is protected by an inner hinged cover which has some marking from when it has been opened in the past.
The watch measures 51mm in diameter excluding the winding stem and the loop. The case is gunmetal and it is in good condition with just light surface discolouration in places but nothing serious at all.
The glass lens is in good condition.
The dial is in good condition. There are a couple of short hairlines at number 3 but they are faint even when viewed through a jeweler’s loupe. There are two subsidiary dials, one for constant seconds and the other records for up to 30 minutes. The chronograph is operated by pressing the winding crown to start, again to stop and then again to re-set to zero. Pin-set hands.

Edouard Heuer patented his first pocketwatch chronograph in 1882 and his first wristwatch chronograph in 1914.