I have a similar movement that I spent hours investigating and yours really looks like mine in some way.
The following movement was manufactured by Otto Maire from Lengnau (Bern). There is no trace of it at Ranfft's page but there are some rare examples online (especially with the brand "Bonheur" on the dial)
Mine (It's not the same size as yours, I measured it at 11.5''' / Dm= 25.6mm. I maybe made a mistake as there is no 11.5''' in this list:
I'm reviving this thread as nobody continued further with the identification. I know I didn't started the thread but I'm quite intrigued with it but I don't have an adequate literature to further investigate.
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