Need help identifying a Delco radio

[jfkheat]

I just bought some parts and other misc junk at an estate auction. There were several radios in the boxes. I have a Delco AM/FM that I need to identify. The model number is 31BFP1 and the product number is 7936011. Do these have any dates stamped on them anywhere? I don't know if it works or not. There are also 2 Delco speakers that have never been used. The part number on them is 16033930. They both have the same part number but one was made in the USA and the other was made in Japan.
Thank you, James

[SS427]

Thanks to Team Chevelle http://www.chevelles.com/radiotech/69_72tags.html , this is my take on it.

31BFP1

3=1973
1=Chevrolet
B=B Body, but may fit other body styles as well
FP=AM/FM push button
1=1st Design

[jfkheat]

Thank you for the info and link. Anyone know anything about the speakers?
James