Seiko 6870,Seiko 6870,WTS] 1990s Citizen 6870 Titanium Chronograph | 130$ : r/Watchexchange,Craftsman's Mark hidden on the Cal. 6870 of the Seiko Credor U.T.D lin – Quaint & Collectible,Citizen 6870 Titanium M Chronograph Quartz Watch for Parts & Repair – Vintage Radar