Some things to watch for in an original 3012.
50 year old wiring & soldering, worn knife edge bearings and ball races, dangling fish wire bias weight (SME later improved this with the pulley type in 3009 improved), stiff headshell connector pins, 5 prong phono connection (Rca conversion kits are available), sagging rubber coupling (Between arm tube and stub), thin base plate, dry bedplate grommets, often depleted dashpot fluid (lift lower) Metal arm rest clasp that marks the arm tube + Any previous cack handed servicing… I’m being picky here but another business we’re closely associated with is one of the UK’s largest vintage SME parts re-sellers. I get to see the above issues on a daily basis. I do use a series 1 3012. It’s a rather different beast but it’s been fully stripped down and rebuilt to address all of the above issues.