Owning 2 380's, a euro 82sel and a us 84se both double row, I can tell you that the change to double row on us models happened about mid-year production in 1983 , so some 83 models had a single row and some had a double row, all euro's had the double row, And $1800 for an 84 380 SE is an average price
, But that's with no or minimal rust.