123 = chassis number
123.130 = specific model of 123
123.130 12 = specific model of 123 with auto tranny and LHD (left hand drive)

Not sure on the next part - it was so much easier with the old style VIN's, but...

101639 the individual vehicle number(??), or range ie: <108309 or
>108309

Means there was a part change or modification at individual number 108309.

If the last part is wrong, someone will step in to correct.

EDIT- Just went out and compared the VIN to the data plate, to see if the last 6 of the VIN appear on the data plate, doesn't appear so. That 108309 cut off number, should as Alon states, refer to the last 6 of your VIN, or possibly the last six of the engine number.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.