I don't really think there is a real meaning .... after all 91 district is very close from Paris : 75 ... and I know for sure there is a 14 CRY 91 car ID, as a 15 CRY 91 or a 12 CRY 91... etc ..... it could had been 13 CRY 75 or even 13 CRY 95 etc ...........after maybe it has a meaning but really I highly doubt about.
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