Hi Siddie,

Many thanks for joining in.  I'm pretty sure it's older than 1980, judging by the age of the lady who owned it and knowing of her latter years but I have no proof of that, so I'm really just guessing. I certainly don't have the knowledge that you people do, so please don't think I'm being argumentative. You could be 100% correct. 

No, I don't intend trying to freshen it or clean it up in case I damage it; I plan to sell it 'as is'. 

Once again, thank you for trying to help me. I value your time and input and appreciate it very much.