got one of these myself, but the 3003 board is a newer version. pot codes are dated ’79. 3003 appears on the board, but not written in solder like early versions, instead it is embedded in the board like each of the circiut runs. knobs are not the flat top variety. original white box calls it a model 3003. i conclude it’s a ’79 model, but original owner said it was from ’77-’78. i’m confused…