13''' Fontainemelon Movement ID for balance staff

Hi all,

I'm working on a Lancet trench watch with a 13 ligne, 7-jewel "Godat" signed Fontainemelon movement for a friend of mine, and am having a really tough time ID'ing the movement to attempt to find a replacement balance staff (and yes, I know this movement is unlikely break any timekeeping records- I'd just love to give him something running from the WW1 era, in which he has a lot of interest).

As you can see, the movement has the "arrow in apple" stamp seen on other Font movements of the era, but the click setup and keyless works are very different from the 13''' Font movements I've seen on eBay. I do have a couple of leads though:

First is this Lancet with a very similar 13''' movement, with same click and keyless works setup, but different bridge arrangement - also signed "Godat": https://www.watchrepairtalk.com/topic/1520-trench-watch-help/

Second is this cool covered trench watch that recently sold on eBay, which appears to share the exact same movement, as far as I can tell from the pics provided: https://www.ebay.com/itm/387075343297

I did take a gamble on a cheap donor Fontainemelon movement similar to the first two examples on this page: https://www.vintagewatchstraps.com/movements.php#fontainemelon1. Unfortunately, while the staff height was very close, the diameter was too narrow to seat the roller table for my movement.

Anyhow, if anyone is able to ID this movement, or has suggestions re. resources to explore, I'd really appreciate it!

Thanks,
Juergen

Thanks for the advice. Unfortunately this movement predates most of the reference examples in the Bestfit catalogs I have access to.

Love the drunken watchmaker story! Unfortunately, a proper lathe is not a possibility in my small Boston apt - fiance & landlord would be out for blood - lol.

A real shame about Ranfft’s current state. As you note, using AI to recover and preserve some of this legacy movement information would be one of the more noble uses of the technology.

Appreciate the response,
Juergen