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6b/159 is the reference number for this type of navigational watch (6b is the prefix for all flying equipment
but I think this can be overlooked in light of the wonderful condition and even tone of the rest of the dial
tells you where each hand is pointing and so reveals the time
There is an excellent article about the Mark 11 watches which gives fascinating context and insight into them here
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Omega R17.8 Chronometer (1942) Current Collection 6b/159 is the reference numberThis is an extremely rare Omega manual wind chronometer dating from spring 1942. The movement of this watch is unusual normally Omega concentrated on producing chronometer using the 30T2 movement. Omega produced a very small number of these movements which were regulated to achieve chronometer performance (that is a deviation under test conditions of no more than a few seconds gain or loss per day). One can only speculate about the reasons Omega