Exactus = Montres Exactus SA / Helios SA, Neuchâtel, Schwitzerland, registered June 26, 1945
Exactus = H. Vuilleumier & Cie., watches, watch parts, cases, dials, La Chaux-de-Fonds, Schwitzerland, registered June 26,1945
They most likely are somehow linked, because registered on the same day.
If you can provide a better shot of the movement, perhaps also indicating some markings if visible, someone might be able to help with an identification of the movement and the age. Looks llike the 1950s to me.
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