Can you help me identify this small old trench(?) watch?

[SteveL]

Bought this from eBay. The case size is ~22mm the movement is 20mm.

[SteveL]

After careful measurement, it is 9.0 lignes.

 

The style of the numbers almost perfectly matches this 1919 Longines pocket watch.

This plus the case mark with the L & F (Longines: Ernest Francillon & Co.) makes me think it could be a Longines.

[RichardHarris123]

The case at least is, 

[SteveL]

Amazing. Thank you!

I can't quite make out the Text. Is it "Levy Freres - B???, France, Registered 1833"? Could you send me a link?

What search app/website is that? It looks useful

[mikepilk]

A picture of the keyless works would help

[RichardHarris123]

Here's the website, it's German but has a translate facility.  Just enter the letters into the search bar. 

[SteveL]

What I know and what I don't know so far.

The case was made by "Lévy Frères" (Levy Brothers) case maker of Besançon, France. The confusing bit is that Lévy Frères is at the same address (25 Rue Gambetta, Besançon, France) as watch movement maker "La Bisontine" (Societe Anonyme d'Horlogerie de Besançon). (see image) The sign reads "Boites Or & Argent Lévy Frères" (Boxes Gold & Silver Levy Brothers)

 

One thing I know for sure is it's not a "Trench" watch. It's a very early ladies wrist watch.

Question 1: did La Bisontine make the movements for Levy Freres?

or

Question 2: is case maker Levy Feres in Besançon France affiliated with Léon Lévy Frères Manufactures des Montres et Chronographes Pierce SA (Pierce Watch Company) of Biel Switzerland? Both companies were founded in the same year 1883 and are within 83 miles of each other.

Question 3: Did either Pierce or Bisontine make a 9 lignes sized movement near the early 1900s?

3 hours ago, mikepilk said:

A picture of the keyless works would help

I'm waiting for my microscope to arrive from Amazon. This movement is far smaller than anything I have tinkered with so far.

[SteveL]

Here is the keyless works.

I was surprised to find no pallet fork. What is this escapement called?

Like I was expecting, the hairspring was shot.

[RichardHarris123]

It's a cylinder escapement. 

[SteveL]

Found it. "Cylinder"