Panasonic 782b

My son bought me a panasonic model 782b for x-mas and I would like to know if anyone can give some information on it.
Ebay has a manual for a 782. But, mine has the B in the number. I can find pictures of the 782 but not one with the B in it.The picture and manual both look the same as mine. Can anyone tell me what the B stands for and is there any value in this radio. It is in great shape. It has one very small dent in the wood on the front. about the size of a match head. One of the knobs is cracked. It plays perfect. I have done many searches and can't find any information on it. That's how I found this forum.
Thanks for any help...