On July 2012 CALIBRE 11 posted :

Ultimate Guide to the Heuer Montreal

The Montreal was launched in 1972, during a period where Heuer began to significantly expand its range of watches.
The new Chronograph series was probably colourful ever launched by Heuer, and combined with its distinctive over-sized case, made for a watch that was quite different to the rest of the Heuer range.
The Calibre 12 Montreal was in the Heuer catalogue for only four years before it was replaced by a second-series Montreal, which lost much of the originality of the first series and swapped out Heuer’s own movement for the latest movement from Valjoux.
While the Montreal name would continue until 1983, those first four years saw the launch of the most interesting watches and the ones that are most collectible today.
The case is what makes the Montreal so special. It’s an over-sized 42mm case with a combination of a star-burst, brushed stainless steel top part of the case and polished surfaces along the side of the case.
The Montreal dial uses the traditional bi-compax layout, with Chronograph minutes at 3 o’clock and Chronograph hours at 9 o’clock. There is no sweeping seconds hand on the watch, so if the Chronograph is not running, there is no movement on the dial.
The White-dial Montreal is the most colourful of the range