No model code and small grey feet and a cream back panel provisionally make this a 1965 model.If it's early 1965 then it's a JTM-45, if its late 1965 it MIGHT be a JTM - 100, checking involves looking inside to see if there's two 50 w transformers and a solid state rectifier. Either way,very collectable, big bucks and DON'T PLUG IT IN without getting it checked first.