I can well envisage that the plate is correct and Contract no 23/S.3714 was the Ministry of Supply contract to rebuild the lorries. This fits in with the likely timescale, and no doubt there was an associated contract to convert some into 17-Pounder FATs.
Any rebuild should have something like "GMC/-" on a plate to confirm rebuild by General Motors, Cleckheaton but this may have only been applied to engines:
Quote:
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Under the Electrical and Mechanical Engineering Regulations, a code was stamped on all reconditioned engines so that any defective units or assemblies could be traced to their source. A code reference number consisting of symbols, indicating the repairer, followed by numerals indicating the month and year of overhaul.
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Thank you for enabling me to write some new history!