Omega Omega - 324.18.38.40.10.001 Speedmaster Date 38 Stainless Steel / Diamond / Purple

Speedmaster Date 38 Stainless Steel / Diamond / Purple

REF. 324.18.38.40.10.001

1/10

Widely produced

Case

MaterialStainless Steel

Diameter38 mm

Lug width18 mm

ShapeRound

CrystalSapphire

Case backClosed

Water resistance100 m

Dial

ColourPurple

IndexesArabic Numerals Hands: Stick

HandsStick

Movement

Caliber3304

Typeautomatic

Reserve48 h

Explore caliber→

In Context

At 38 mm it sits just under the modern norm — the band that suits the widest spread of wrists. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 48 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

324.18.38.40.10.001 stands on its own in this catalogue — no other reference here shares its base number. It pairs a purple dial with a stainless steel case. Beyond the time it carries a chronograph.

Inside: Caliber 3304

Explore this caliber →

The 3304 is Omega's Valjoux 7753, the chronograph with its counters at 3, 6 and 9 o'clock, introduced around 2009 for the Speedmaster Date. It powers 16 watches in this library, every one a Speedmaster Date. The 7753 rearranges the 7750's counters to the horizontal axis and moves the date correction to a pusher; the [7750 piece](/blog/the-valjoux-7750-family) explains the cam-actuated base. Omega's version runs at 28,800 vph with a 48-hour reserve and 27 jewels at 30 mm across and 7.9 mm high, and it replaced the 6-9-12 layout of the [1164](/calibers/omega-1164) in the Speedmaster Date, unlike the Piguet-based 3301, 3303 and 3313 of the same years. In the library it powers 16 [Speedmaster](/brands/omega/speedmaster-automatic-quartz) Date references at 38 mm and 40 mm, in steel and two-tone. 2 are limited editions. The [3330](/calibers/omega-3330) is the co-axial column-wheel chronograph that succeeded it in the smaller Speedmasters.

15 other watches in the library run the Omega 3304.