The OG series of mercantile convoy began in October 1939 and was an amalgamation of the OA series from Southend and the OB series from Liverpool. The two convoys of the same number would meet off Lands End to become the OG series to sail onwards to Gibraltar. This practice was continued until July 1940 when the OG series sailed directly from Liverpool. The OG series was discontinued in October 1942, replaced by the KMS series.
There were no cancelled convoys.
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