Ed and Rob: Thanks for your comments. The blocking out of CFR numbers in the early 1950's probably had some pattern but as time went on it became more of a free-for-all. Given the lack of written documentation about the production and serial numbers in the early 1950's, the only way to piece together a story is to inspect surviving vehicles. Fortunately a surprising number of 1952 M38CDN and 1953 M38A1 jeeps survive and that makes the process interesting.
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