The Vintage Wrist Watch Company has dated this piece to the 1900s.
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.
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 diameter excluding the winding stem and the loop. The case is gun metal 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 jeweller’s loupe. There are two subsidiary dials, one for constant seconds and the other records 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 pocket watch chronograph in 1882 and his first wrist watch chronograph in 1914... the crown was at the 12 o'clock position as these first wrist watch chronographs were adapted from the pocket watch design.
The watch comes in an antique presentation box.
The Vintage Wrist Watch Company has dated this piece to the 1900s.
Specialists in antique and vintage wrist watches and pocket watches
You can view the stock and full dealer information on the The Vintage Wrist Watch Company Profile Page