I share with you my discovery.
Information on the day and month of assembly of the finished frame "September 18".
I specify a date of end of manufacture.
Must also be present on your trucks.
My photos will help you identify the location.
Ps:
All the parts forming the frame have a number, 35242 for CROSSMEMBER ASSEMBLY, REAR this number can be specific to M724.
The source of the topic:
M724 across the Atlantic.