With its original black dial, this Gyromatic from Girard-Perregaux is a handsome alternative to a Longines or Omega.  Model reference C 7604 A.


Girard-Perregaux make some very nice watches, but they are difficult to date accurately.  However the movement they used in this watch was co developed with Doxa, Eberhard & Co., Favre-Leuba and Zodiac and this dates to circa 1960.


The 31 series movement that is used in this watch has semi quick set date and runs at 21,600bph.  It also has 25 jewels and an interesting regulating gear for precise time keeping, and it is all working well.  Some models of the Gyromatic had 14 extra synthetic rubies in the roller wheels, but this is the simpler design and the 39 jewel Gyromatic can be a little fiddily to maintain unless you are familiar with them.  We are very careful when buying black dials from this period – not only were they not offered as much as they are today, but black is also the favourite colour of the dial restorer.  But we have examined this under the microscope and are happy it is original.  As is the crown, with the GP logo stamped on it.  The acrylic crystal has a date magnifier under the crystal (so not like a Rolex Cyclops).  The case has some corrosion on the outside of the seal, on the threads of the screw down case back.  But is is still screwing down cleanly and the seal did its job and the water didn’t get to the movement.  The leather strap is new, and could be swapped for a different colour if preferred.

This watch will be supplied with our branded presentation box and our Certificate of Authenticity.

Please see the HD video for more detail.  All photos and videos are part of the description and are of the actual watch unless mentioned.  We do not photoshop any pictures, and the images are copyright of birthyearwatches.com and should not be used without permission.


Width with crown  36.1 mm

Width without crown  34.3 mm

Between lugs  18 mm

Lug to lug length  41.8 mm

Case Thickness  10.4 mm

All sizes are approximate.  The watch is photographed on a wrist of 190mm/7.5 inches.

Included with this watch is a 3 month guarantee and free delivery to UK addresses.  If you live outside the UK we can still deliver to most countries.  Please see our Worldwide Shipping information, or Contact Us.   Payment can be made by most credit or debit cards, bank transfer or PayPal.

From 1st September 2021 we will be planting a tree for every watch we sell, working with the International Tree Foundation (Est 1922) to make this business positive on carbon.  By buying anything pre owned you are effectively reusing what already exists, but this takes it further and makes us feel good.