42×55mm

Case Size

15mm

Thickness

94g

Net Weight

3ATM

Water Resistant

0

Batteries Needed

Is this a real automatic watch?

Yes. The Business Tonneau uses a genuine JX-2805 automatic mechanical movement — no battery required, ever. Verify by watching the seconds hand: it sweeps continuously, not ticks. Manual crown winding produces graduated resistance as the mainspring tensions. Full automatic vs quartz comparison →

What crystal does this watch use?

Mineral reinforced glass — a hardened glass crystal that provides good everyday scratch resistance for business and professional daily wear. It is not sapphire. We state this clearly because honest product descriptions build the trust that earns long-term customers. For sapphire-coated crystal, see our Phantom Skull Skeleton.

Is this watch suitable for business wear?

Yes — this is specifically designed for professional contexts. The tonneau case slides under a shirt cuff without bulk. The skeleton dial reads as architectural and intentional across a conference table. The brushed stainless steel finish is appropriate for formal business settings without being flashy. This is the watch that gets noticed by people who look closely, without announcing itself across the room. Why skeleton watches work in professional contexts →

Does the tonneau case fit under a shirt cuff?

Yes — this is one of the tonneau shape's key practical advantages over round cases. The tapered ends at 12 and 6 o'clock create a lower profile that slides under standard shirt cuffs without the resistance a 42mm round case creates. At 15mm thickness, the case sits comfortably beneath most dress shirt and suit jacket cuffs. Full tonneau watch guide →

How accurate is the JX-2805 movement?

Expect ±20–30 seconds per day — standard for a non-COSC automatic movement. Set the watch weekly against your phone and it will never be noticeably wrong in daily business use. This accuracy level is universal across automatic movements at this price point and is not a limitation of this specific caliber.

Can I swap the strap to leather for formal occasions?

Yes. The 25mm lug width accepts any standard 25mm strap. For formal occasions, swapping to a dark leather strap significantly elevates the watch's professional formality. The swap takes approximately 30 seconds with a standard spring bar tool. We recommend a dark brown or black leather strap for maximum professional impact.

Is this a good gift for a professional man?

Yes — one of the strongest gift choices for a man in a professional context. The tonneau skeleton communicates that the giver researched the gift carefully rather than choosing a default option. Arrives in gift-ready packaging. 2-year warranty included. 30-day returns if the size or style is not right. Full watch gift guide for him →

What is the difference between the Business Tonneau and the JC-9?

Both use genuine automatic movements and share the same tonneau case dimensions (42×55mm). Key difference: the Business Tonneau uses the JX-2805 movement and is styled specifically for professional business contexts — brushed steel, businesslike finishing. The JC-9 uses the JX-2807 movement with a sport-oriented dial layout designed for broader daily versatility. Same case, same price, different movement caliber and dial character. Choose Business Tonneau for office and formal; JC-9 for gym-to-office versatility.