I keep trying to post here but it is not working. I'll try again.
I have a US made Blaupunkt Montreal CR40. Don't know what it came out of. It is in my 1983 Porsche but I think it is mid-late 80's Every online picture does not match this older unit. This has no card slots and only 5 presets. The part number and serial numbers are not what I see online also. The serial number is stamped into the side with no letters at all. The part number is on the original label on the top of the unt.
Any help at a possible code is appreciated.
Blaupunkt Montreal CR40 Ser#62008127 part#A 412 403 853