copy a mid 20s Buescher True-Tone and have it 3d Printed from plastic. Have it replicated from carbon-fibre, PVC, stainless steel, titanium, MDF etc etc, attach original key cups and mechanics and no two experiences will be the same. Modern horns have modern mechanics (playability) and usually a cheaper material due to ever escalating material costs and this influences the sound / tonal characteristics of the instrument not to mention their ease of playability. Oh sure savvy sax makers know the differences and they do their best but older horns don't compare on the ergonomics stakes. Personally I prefer older horns but...when I pick up my MKX it simply functions flawlessly, is not so Mouthpiece dependent and is a bloody joy to play. I adore my True Tone, the old Dolnets, G.H.Huller, SML super 44 and 51 Amati Toneking if only for their tonal palate but.....the contemporary Keilwerth plays like air-guitar in a alcohol induced euphoria. If I want that same euphoria without the alcohol - I reach for the vintage saxes.