I purchased my 1680 red Sub from my now deceased father-in-law in 1976. It was new in 1972 with a serial number beginning 332. I paid $150 for it. It still keeps perfect time and looks great because mainly I wore it in the office and in court. I did break the 9315 band, and saved most of the pieces, but the clasp is missing along with some links. It has an aftermarket band that has served me well for the past 30 years. I last had it "cleaned & oiled" in 11/16. Tried to get that done about a month ago, but the only authorized Rolex mechanic nearby said they are so overwhelmed that it would take at least 13 weeks. Since it is working just fine now I said I'd come back when they were less busy. I have no need to sell at this time, and it would take a lot of money to convince me to part with it . I am 73 and will likely leave this to my kid.