Got this recently from the bay for 99p. Working fine. It needed a new crystal and strap (not easy as its 19mm - I had to use a file on the strap). The face is marked 'French Ebauch'.
The movement has the France Ebauches symbol and 233-72-E.
This is the FE derivative of the Cupillard 233. Nice article here.
Nearest version online is the FE 233-70A:
Like mine, no second hand.
You may notice the lump of cork that I have wedged in to keep the movement holder in place as it tended to vacate its little notch and the dial fell away inside the case. Works a treat.
The case looks stainless steel. But it isn't as these gouges from the previous bracelet reveal brass.
Montine seems to be an undocumented brand, but if anyone knows about it please share.