Belle Époque 1900s Antique French Gold Case Pocket Watch Pendant

Edit: I identified the maker's mark! 
A powder blue guilloche enamel swirls like watercolor, framed by a gentle wash of faded green at the center. My favorite are the tiny diamond cut roses that shimmer across the surface. The watch no longer runs so set it to a moment in cherished time when it meant the most for you. It's a vessel for the moment you never want to lose track of. 

Ideas to wear:

On a long chain as a pendant that sways with you
Tucked into a blazer pocket for a subtle old world flourish
Resting on your desk as a tiny piece of art 
Tip: if you so desire to open the pocket watch, press gently at the black button at the top and gently open at the lip. To close, press the button again and then shut. Shutting without pressing the button can damage the mechanisms inside.

Specification
Dated: 1900s The size of the pocket watch as well as the floral detailing connects it to the Belle Époque era.
Origin: French horse head hallmark (utilized in 1838-1919) 
Maker's Mark, a "SG" with a key.  Société Générale des Monteurs de Boîtes Or de Besançon / General Society of Gold Case Assemblers of Besançon
They were founded in 1880 and were significant producers of gold watch cases. Located in Besançon, a city where Swiss watch makers settled there after the French Revolution. By the late 1800s, this city was the leading watch producer in France. They were known for manufacturing the gold cases, the watch movement was produced elsewhere. This gold case manufacturer unfortunately closed their plant by 1970. 

Thanks to this heritage website, they go into more details

Also would like to thank Jean-Jacques Richard he wrote a blog post about a reader's question on their wrist watch and had great information about this company. 

15k gold on the edge and on top of the fob, it’s also testing 18k gold in other areas. Platinum topped diamonds.

Rose cut diamonds/diamond chips

Power blue guilloche enamel

3541 serial number on the inside 

10.29 grams

1” in length including the fob at the top

.75” in width

Condition

Watch no longer runs. Faded center enamel on the face and some fading evident on the watch’s face. Scratches on the interior. 

Chain not included