| Brand | Longines |
| Caliber Number | L686.2 |
| In-House? | No |
| Base Caliber | ETA 7754 |
| Movement Type | Automatic, self-winding mechanical, chronograph |
| Lignes | 13.25”’ |
| Diameter | 30mm |
| Height | 7.9mm |
| Jewels | 25 |
| Power Reserve | 46 hours |
| Beat Rate / Frequency | 28,800 bph / 4Hz |
| Lift Angle | 49 degrees |
| Shock System | Incabloc |
| Regulator | Etachron |
| Rotor | Ball bearing |
| Chronograph System | Cam style |
| Chronograph Layout | 12-6-9 |
| Hand Count | 7 |
| Features | Central hours; central minutes; central chronograph seconds; central GMT hand; small running seconds at 9:00; 30 minutes chronograph counter at 12:00;12 hour chrono counter at 6:00; date at 3:00 |
| Hacking Seconds? | Yes |
| Country of Manufacture | Switzerland, Swiss made |
| Known Models | Longines Admiral Chronograph GMT (Ref: L3.670.4.76.6, L3.670.4.76.3), Longines GrandeVitesse, Longines Master Collection 44 Chronograph (Ref: L2.740.4.73.3) (Add your watches to the comments below…) |
The Longines caliber L686.2 is an automatic chronograph watch movement found in various Longines chronograph GMT watches.
The L686 is basically an ETA calibre 7754 with a branded rotor. The 7754 is based on the popular ETA/Valjoux 7750, with a GMT complication for tracking a second time zone.
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