BMW VIN-Decoder for BMW Vehicles since January 1928 (including: motorcycles, Mini, Rolls Royce):
http://www.bmwarchiv.de/vin/ (German)
http://www.bmwarchive.org/vin/bmw-vin-decoder.html (English) (idem)
(nowadays: http://www.bimmer.work/)
Indicate the last 7 characters of any VIN of a BMW car (
"Submit Query") and you get a complete list of all the production specifications (production date + production plant + standard equipment + optional equipment). You can also save the datasheet as PDF.
Feel free to check yours. It is accurate.
Alternatives:
http://www.etk.cc/ and
http://www.bmwvin.com
EDIT: https://bmwvin.co.uk
VIN decoder also showing recently logged mileage (Central Data)
(hat tip to forum fellow
lexmedia for the tip)