A Seiko 7018-7000 automatic fly-back chronograph from 1971 | Adventures in Amateur Watch Fettling,A Seiko 7018-7000 automatic fly-back chronograph from 1971 | Adventures in Amateur Watch Fettling,A Seiko 7018-7000 automatic fly-back chronograph from 1971 | Adventures in Amateur Watch Fettling,A Seiko 7018-7000 automatic fly-back chronograph from 1971 | Adventures in Amateur Watch Fettling,Vintage Seiko] 7016-7000 with flyback chrono function. The looks reminds me of the Hodinkee Alpinist : r/Watches