It's definitely the 83 model. As for size I'm sure it's the biggest. I'm 6ft 3 and it's perfect.
I too am not sure of its value. I wasn't particularly looking to sell unless a decent offer is made. Considering it has new tyres and has been serviced. It's all in good nick.
Cheers.
Yes I do have some pictures. I'll see if I can work out how to attach a photo and yes I have the bit from the original Raleigh catalogue.
Turns out I can't leave a URL link or attach my photo as it's too big.
If you want to see pictures google search Bike Forums and search 1973 Raleigh...