Online source: http://www.gvrdeu.org/M38%20Service%...umber%20DB.pdf
Near the bottom of the referenced document (above weblink), there seems to be documented CAR numbers for M38CDN's up to 52-32068. That is 84 digits off the number in question.
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1953 M37 CDN
1953 M38A1 CDN W/WN
1967 M38A1 CDN2 W/WN
1968 M38A1 CDN2 W/WN
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