Hi I have a sealey 150 super mig with large gas bottle, bought it new used ita few times and its been sitting in the garage ever since prob 8/9 years? Just wondering how much its worth?
Go on ebay, do a search and tick 'completed listings', that will give you a rough idea.
Oh, and if by 'large gas bottle' you mean one that has BOC, Air Products or similar written on it then unfortunately it's not yours to sell.