Longines Ultra-Chron
High-beat 36,000vph chronometer line launched 1968, revived 2022.
2 references
“Differs” marks a spec with different recorded values. — means not recorded.
| Spec | 7970 Ultra-Chron Diver, original 1968 production | L2.836.4.52.6 Ultra-Chron Diver Re-edition, Steel Bracelet |
|---|---|---|
| Case size Differs | 41 mm | 43 mm |
| Lug to lug | Not recorded | 48 mm |
| Thickness | Not recorded | 13.4 mm |
| Case Differs | stainless steel, cushion | stainless steel, brushed and polished, cushion |
| Bezel Differs | stainless steel bezel with Bakelite/plastic insert unidirectional rotating | stainless steel with sapphire insert unidirectional rotating |
| Crystal Differs | acrylic | box-shaped sapphire, anti-reflective coating |
| Water resistance Differs | 200 m | 300 m |
| Caliber Differs | 431 | L836.6 |
| Movement maker Differs | Longines | ETA |
| Movement type | Automatic | Automatic |
| Jewels | Not recorded | 25 |
| Frequency | 36000 vph | 36000 vph |
| Power reserve | Not recorded | 52 h |
| Dial Differs | black | matte black, grained / red |
| Indices Differs | applied markers | applied hour markers, quarter markers luminous |
| Lume Differs | tritium | Super-LumiNova |
| Hands Differs | baton, white | baton, white with red minute hand |
| Bracelet Differs | steel bracelet | stainless steel bracelet |
| Produced Differs | 1968–1974 | 2022 |