First off, the VIN/Chassis number is one of the same.

As for the construction of the number, the eleventh entry is a letter and not a digit

They're all digits, some are letters and some are numerals. Even the North American VIN construction is displayed differently in the EPC. For example, my 260E has a VIN starting WDBEA26, while the EPC converts that to WDB124026.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

Right, but again that's the chassis number, the VIN is different.

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Not technically correct.

M.B.'s in the states have a slightly different version of V.I.N. than R.O.W.