chassis number decoder, is this right? Options

[914 RZ-1]

So I'm looking for something that will tell me what the numbers mean on the chassis number. I find the "chassis number decoder" info shown. However, it doesn't seem to work. Am I missing something? My chassis number-found on the inside front fender on a plate (is this supposed to be the same as the VIN number?)-is 472 2910951, door sticker says car was built in Feb '72.

So using the decoder it seems my car was built in the 29th week of the year (29) on Monday (1) at the Karmann factory (9) and it was the 51st car built that day.

By the way, the chassis plate states the car was "Made in Germany", but there was a West and East Germany back then, so what gives?

[stevend914]

Question on counting the weeks: In my case the first of January is on a Thursday so the first week of the year is a partial week, is that week still considered the first week or is the first full week of the year considered the first week? (IMG:style_emoticons/default/unsure.gif)

Thanks