Code for Blaupunkt High CD Alfa 156?

Hi everyone -

And thanks for offering your help to guys like me.

I just bought a 156 Alfa. I want to put back in the original CD radio which I have, but I don't have the code. Well, I do have a code handwritten on user's manual, but it doesn't work (Handwritten code is 1633).

Here is the serial:

BP - Nr.
7 640 378 316

Prod. Nr. Fiat
156 034 209 0

BP037834857459

E1 021613

Can anybody help me ?

Thanks a lot in advance cuz the replacement CD player that came with my car is ugly and really spoils the looks inside !