Hey, just got this 73 mercedes a couple of months ago for a pretty good deal i thought, and was wondering how much it really could be worth as a classic. Its been in a garage most of its life with 120k miles, runs great, has its original black leather interior, fading slightly which im hopefully going to change, but for honesty's sake it is fading a little haha. Bright yellow paint job, matching mercedes hubcaps. Almost seems like luxury class with its bouncy leather seats and power windows, auto-lock, and various other good commodities i havent seen in cars from 2000+. Starting to make some funny knocking sounds at start-up, going to take it in soon for a check-up but other than that it runs and sounds great. Im mainly posting to ask if i got it checked up and whatever is knocking fixed, how much could this car go for to the right buyer? Please, multiple opinions will help greatly! Thank you