The invention relates to a timepiece fitted with an acoustic mechanism, such as a minute repeater mechanism, the noise level of which is particularly high. This timepiece comprises: - a case (1) comprising a sealed part (2) and an unsealed part (3), - a striking mechanism (40) located in the sealed part (2) of the case (1), - at least one gong (10, 30) intended to be actuated by the striking mechanism (40) and situated completely in the unsealed part (3) of the case (1).