smallzoo, you are quite right, you are in the 120 forum, the 120 for sale is not, sorry.
Agree with karl2000, but understand where you are coming from.
At that price and If it's in your area, worth a look to get a feel, as any others you see you will be going in blind in some respects where faults are not mentioned on mot or by seller, take the mot as a guide only as they can and have made serious omissions and statements sometimes, as have sellers with something to hide.
I know it can be daunting (we have all been there) but checking for yourself in person with an open mind on anything that you think might do will confirm. You will quickly know it measures up.
Members don't offer to other members with known/undisclosed faults, whereas buying from an 'unknown' could be a worse choice, and some have looked at many, many, before making choice.
Being realistic, are you expecting to find a corrosion/weld/fault free example of any series, especially a 120 ?
Its very rare to find any of older cruisers especially, (and sometimes much newer) corrosion/weld free at the price you have in mind, unless it is an import from warmer/salt free climes for more money, or has been looked after top AND bottom from the start, or close to.
Just saying.....your money, your choice.
Good luck with your search.