If you have been searching for a refined automatic that never needs babying, start here. Hamilton's Jazzmaster Performer Auto in 34mm, reference H36105140, is built on the idea that elegance and everyday durability can share one stainless steel case.

The heart of the matter is the H-10 caliber. Developed from a proven Swiss base, it slows the balance frequency to 21,600 vibrations per hour to stretch the power reserve to roughly 80 hours, more than three full days, and its Nivachron hairspring shrugs off the magnetic fields from phones, laptops and bag clasps. You can watch it work through the exhibition back, a detail many watches at this level skip.

The look is clean and modern: a blue dial with a sunray finish, a fixed bezel carrying a minute track, and a matching steel bracelet. Because it is rated to 100 meters and has a screw-down crown, a swim on vacation is no cause for worry. It is a natural pick for anyone, of any gender, who prefers a modest diameter without giving up mechanical substance.

Inside the Performer Auto 34 (H36105140)

• Size: 34mm across, 11.18mm tall, steel case
• Movement type: self-winding H-10, 21,600 vph
• Running time when fully wound: around 80 hours
• Hairspring: Nivachron, anti-magnetic
• Face: blue sunray dial with Super-LumiNova on hands and markers
• Protection: sapphire crystal, screw-down crown, 100 m rating
• Bracelet: stainless steel, deployant clasp with push buttons

Long reserve, modest size and blue that catches every glance: an easy automatic to live with daily.