what am I looking at? 15 jewels 18 size no serial.

[Dmitry]

Hello,

I came across this 18 size somewhat modernish pocket watch with SR hallmark under the dial. There are no other marks or even a serial number. Number 25 in the cutout on the mainplate where the balance wheel is resting.

The balance cock has AF/SR abbreviations, so it is not purely swis or american.

The dial says Boston.

3/4 plate on the back and the mainspring barrel reminded me of waltham, but the barrel is giant.

Does anyone know what the SR stands for?

If anyone can help with a new stem, sliding pinion and setting lever (you can see it is broken).

[clockboy]

[grsnovi]

The mark "SHR" (Societe Horlogere Reconvilier) is for Reconvilier however Ranfft doesn't show a "25" - they start at "26". In 2018 Ranfft posted re: a 15 jewels/size 18 not yet added to his database on Watchuseek (where there are 4 pages of posts with the word Reconvilier)  A subsequent post refers to a Reconvilier 12.