A quick look reveals a number of the trailers after CFR 71282 are listed as 1951. However, the serial numbers are not in the normal MCI format. Normally they ran from 0001 and ran up to somewhere around 1275. These numbers are:
CFR 71282 = serial no 01209391
71287 = 01209375
71278 = 01209383
71292 = 01209821
71333 = 01209464
17302 = 01209426
71303 = 01209807
Perhaps check on the G503 and see if the US M100s of that time period have serial numbers like these. Perhaps the real manufactuerer can be found.
Note that according to the data plate, the actual serial number of, say trailer serial 0018 would be something like MCI/M100/0018.
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