Posted the question over at WW2talk, and I think was given a good lead. A member recognized 1543 as a "number of a Ferry Service from LSI J32 HMS Duke of Wellington to Juno Beach".
Though I don't believe that is exactly it (LSI only landed troops?), I think it's correct to assume the marking immediately below the census number is indeed the loading codes, presented in a vertical format.
regards,
Jack
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