For sale: Sicura Diver 400 Vacuum Tested, a rare Swiss dual-crown compressor-style diver from the 1970s. This is a large 40 mm vintage tool-watch with a hand-wound movement, tropical bezel and strong wrist presence — highly sought after by collectors of Sicura/Breitling-era pieces. The watch features: – Two crowns – Original tropical black bezel – Thick stainless-steel case, vacuum tested – Swiss hand-wound mechanical movement, running – Original dial with aged lume and vintage character Details – Brand: Sicura (Swiss Made) Breitling– Model: Diver 400 – Vacuum Tested – Case size: 40 mm without crown – Case type: Dual-crown compressor-style – Movement: Mechanical hand-wound – Bezel: Rotating, original, tropical patina – Crystal: Acrylic – Strap: Vintage rally strap included – Functions: Hours, minutes, seconds, date – Condition: Good vintage condition with normal signs of age – Rare and increasingly hard to find, especially in this configuration Notes Classic 1970s Swiss diver, strong collectible value and impressive wrist presence. Shipped safely and securely packaged.Photos are part of the description.