Not real difficult to realize that that design had to be that way on the curved soprano until Yanagisawa made a soprano with a 'balanced action' bell key layout, plus the fact that everybody has copied Selmer.
http://www.ebay.com/itm/YANAGISAWA-...487?pt=LH_DefaultDomain_0&hash=item43aa073f37
http://www.ebay.com/itm/YANAGISAWA-...487?pt=LH_DefaultDomain_0&hash=item43aa073f37