Under the Omega-Lemania SSIH umbrella, early-’50s Tissot bumper automatics delivered robust everyday Swiss quality.
Dating & Context Rationale: Caliber 31-1 (early bumper automatic, c.1953–56) + case ref. 6540-1 + “Antimagnetique” script and period logo ⇒ circa 1955 (±2). 

SPECIFICATIONS

Movement: Automatic (bumper), Cal. 31-1, 17 jewels, ~18,000 vph, Incabloc.
Movement tested and running well. No service history available. Full-price purchase includes a complete overhaul (€369 value) and official service certificate — see details below.

Dial: Silvered with applied Arabic numerals and railroad sub-seconds at 6. Professionally restored by a dial specialist using period-correct techniques; crisp black print and even silvering. Gold dauphine hands fills to match.Case: Stainless steel with screw-back (6540-1). 
Size: 35 mm (without crown) — Lug width: 18 mm — Lug-to-lug: ~43 mm.
Crystal/Crown: Domed acrylic crystal; unsigned, period-correct crown.

Strap/Bracelet: New olive canvas/NATO, 18 mm — shown on an 18 cm (7.08 in) wrist.
Water-Tightness: Splash Water Resistant (handwashing ok, not showering).
Box / Packaging: Box — Special customized secure black travel watch case.

📦 What’s Included

Box/Case: Secure black travel watch case.
Documents: invoice.

🚚 Shipping, Returns

Insured worldwide shipping.
14-day inspection period (unused, tamper seals intact).
Professional packing with tracking.

🛎️ Call-to-Action

Questions or an offer? Click “Negotiate Your Price.” Serious collector inquiries welcome.

🔧 Service Benefit (Full-Price Advantage)

✅ This is a premium-level advantage — available exclusively to buyers who choose the full listed price.

💰 If you ever decide to sell the watch, a documented service will significantly enhance its market appeal and resale value.

🛠️ A professional service worth €369 — included free of charge.

The service includes:
Full disassembly, ultrasonic cleaning, and lubrication using Moebius synthetic oils
Regulation and timing adjustment
Ultrasonic case and bracelet cleaning (if applicable)
Final technical & aesthetic inspection

📄 An official service certificate is provided, listing key technical and identifying details — ideal for insurance, provenance, or future resale.

🛡️ This ensures peace of mind and removes the need for servicing for the next 3–5 years.