ESA caliber 940.111 quartz movement found in a vintage 14K gold Baume et Mercier watch (ref: 651125). The movement in the B&M was signed BM12100 / Seven 7 Jewels Unadjusted / Swiss / V8.
ESA aka Ebauches S.A produced movements for brands such as Omega, Eterna, Certina, IWC, Longines, Tissot, Zenith, and more.
The ESA caliber 940.111 takes a battery cell number 390. you will need to remove the screw holding the tab. The battery cell should be positive side down. Putting the tab back in place is easy thanks to a notch that holds it in place while you tighten the screw back down.