I estimate the lower hull Paul has was made in the first week of February, 1943. Once Paul determines if it is a C01UC or C21UCM we could look for comparable examples that have either the Data Plate or the driver front armour data. Working backwards we could identify the series of WD numbers using the material Nigel Watson published. By example, CT112283 - CT114302, or CT161787 -CT162284 for the C01UC plus CT162911 - CT163910 for the C21UCM series.
However, when looking at carriers produced within days of each other, the WD numbers do not reflect that timing. Until more information surfaces, we can only guesstimate.
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