Mainly by specs: 1 piece mahogany(african) body 2 pieces maple top not veneer,long tennon,laquer finish(try acetone test) and yes,it says LS150 and the colour nomenclature(HDC on mine=Heritage Dark Cherry) inside bridge cavitie).Some tops are AAA flamed,but it was designed to be a plain or lightly flamed as mine.Also has got CTS pots and Orange Drop caps and cotton wires(old style).The neck is '58 style in opposite to the rest of models(excluding LS70),It's a wide neck(wider than Gibbo 50's which has round edges as oppostite to Tokai more straight).....Pick one if you can they are going up in price....