Series 8
Citizen’s mechanical sport line — launched 2021 to re-establish the brand’s 1970s "Challenge Timer" and "Leopard" mechanical heritage. The 870, 880, and 831 GMT references use Citizen’s in-house 9051/0950/9054 calibers — the rare mechanical carve-out in a brand catalog otherwise dominated by Eco-Drive quartz.
Sub-lines
- OpenThe Series 8 870 — 40.8mm steel three-hand reference with Citizen’s Caliber 9051 (50-hour reserve, ±10/-5 sec/day rating). The NB6004-83E is the contemporary reference design.
- OpenThe Series 8 880 — 40mm dressier integrated-bracelet reference with Citizen’s Caliber 0950 (60-hour reserve, ±10/-5 sec/day rating). The NA1004-87E carries a guilloché dial drawn from Citizen’s 1960s Leopard line.
- OpenThe Series 8 831 — 41mm steel GMT with Citizen’s Caliber 9054 (50-hour reserve, true-traveler GMT with independently-jumping local hour). The NB6011-11L is the contemporary reference.