I emailed the seller and the movement number, according to his response, is 20542898.
It is possible for an outlier number according to Speedmaster 101: * (Edit October 2017 – since writing this site, MWO has produced serial ranges for the last 2998’s as a group. So they suggest that 2998-6, -61 -62 can fall into the range 18419xxx to 19834xxx. As they spent time at the Museum with the records I would suggest readers follow this range when viewing a watch).
Plus there is an outlier for the 105.002-62:Serial Range: 1958 4xxx – 1983 4xxx and 2052 5xxx
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