Thomas' Timepieces - Seiko 6138-3000 and 6138-3002, both models often referred to as the Seiko Jumbo. The Seiko 6138 was arguably the world's first automatic chronograph (Zenith/Movado El Primo also claimed to
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1973 Seiko 6138-3002 "Jumbo" Chronograph
SEIKO 'JUMBO' Chronograph ref 6138-3002 watch review of this vintage classic!! - YouTube
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hidden gem: the Seiko 6138-3000 - LUXUWRIST
Seiko Automatic Chronograph John Player Special - Etsy
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Lincoln Bracelet (Seiko 6138) – Uncle Straps
Vintage Seiko 6138-3000 JUMBO Chronograph Automatic Black Dial Men's Watch work | eBay