With reference 311.30.44.50.01.001, this replica speedmaster 311304 is the stainless-steel co-axial chronograph that bridges the classic Moonwatch lineage with automatic winding convenience. At 44.5mm in steel, it wears larger than the 42mm Professional but keeps the signature Speedmaster dial layout with three sub-registers and a tachymeter bezel. The black dial and applied Omega logo follow the brand’s current design language, while the steel bracelet with polished center links carries through the finishing standard set across the modern Speedmaster range.

Technical Overview

• Case diameter: 44.5mm
• Case material: stainless steel
• Dial: black with applied luminous indices
• Crystal: sapphire with anti-reflective coating
• Bracelet: stainless steel with folding clasp
• Movement: automatic co-axial chronograph
• Functions: chronograph, date, tachymeter

The 311.30 reference uses a column-wheel chronograph mechanism with vertical clutch engagement, which allows the chronograph seconds hand to start smoothly without the slight stutter that horizontal-clutch designs sometimes produce. This mechanical detail is invisible in daily use but reflects the engineering priority Omega places on chronograph precision in this line.

Inside the Movement

The co-axial escapement in this caliber reduces the sliding friction that wears down conventional lever escapements, extending the time between required services. Combined with a silicon balance spring resistant to magnetic interference, the movement addresses two common reliability concerns for mechanical chronographs. The automatic winding rotor eliminates the daily hand-winding ritual required by the Professional Moonwatch, trading a fraction of case thickness for convenience. If you prefer the stealth aesthetic over steel, check the 311.92 black ceramic version which houses a similar caliber in a fully ceramic case. The full Speedmaster collection includes both manual and automatic references across all materials.

What Sets It Apart

The 311.30 occupies a specific niche within the Speedmaster catalog. It gives you automatic winding and a date complication in a recognizable Speedmaster body, without the material premium of ceramic or the heritage restrictions of the hand-wound Professional. The 44.5mm case is larger than the Moonwatch but wears proportionally because the lug-to-lug distance stays manageable on most wrists. The combination of daily convenience and chronograph capability makes this a practical choice for anyone who wants Speedmaster identity in a modern package. This replica speedmaster 311304 fits the role of a primary daily chronograph that does not require adjustment each morning.