GMT module on Soprod's M100 (ex-A10-2) base. Soprod spec sheet: 11½ lignes, casing Ø25.60mm, 4.10mm high, 25 jewels (Incabloc), 28,800 vph, 42h power reserve, bidirectional winding, display H/MIN/S/24h in the centre, date at 3; crown positions: 1) hand winding, 2) quick-set date / 24h hand, 3) time setting with stop-second. The 24h hand is quick-set independently, so this is an "office"/"caller" GMT (Caliber Corner: same function as the ETA 2893-2). Accuracy is offered as COSC, R4, R7 or R12 "according to technical specifications"; Soprod does not publish the R limits on the sheet (its P024 R12 spec is 0 to +24 s/day, not confirmed for the C125). Decoration levels: Manufacture, Excellence, Optimal.