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The case back has the original military markings: 0552/924 is the stores code for a chronograph wristwatch
As this watch was issued to the RRAF it avoided having the original radium luminous dial replaced in the 1960s (something that happened to almost all the others Omega 6b/542s)
This new case replaced the low-cost alloy cases which the watches were ordered with and allowed the RAF to keep using the high quality movements
The watch has a power-reserve indicator on the left of the dial
IWC Mk 11 Current Collection The case back has theThis is a rare and desirable International Watch Company Mark 11 navigators wrist watch, to quote the original Ministry of Defence specification, The wrist watch Mk. 11 is a highly accurate time piece suitable for astro navigation purposes. This watch was used by the navigator in an RAF plane in conjunction with a bubble sextant to calculate the exact latitude and longitude of the aircraft. This method was in principal the same as that used by sailors