It's been 5 years since I've had to add a new SML model. This one was e-mailed to me. The serial is 443x. The e-mailer said that the horn's currently in the shop, but will send me some more pics when it's finished.
As always, double-click to embiggen. The additional side key above the altissimo E/F vent key is an altissimo D# and the one between the
and 
is a G# trill (confirmed with e-mailer, just to be sure). That's the same combination that's on the split-bell-key Le Strama Super models. (The Super 42 doesn't have these keys.) That suggests that there may have been Super models since slightly after SML started producing saxophones until 1949.
As always, double-click to embiggen. The additional side key above the altissimo E/F vent key is an altissimo D# and the one between the
and is a G# trill (confirmed with e-mailer, just to be sure). That's the same combination that's on the split-bell-key Le Strama Super models. (The Super 42 doesn't have these keys.) That suggests that there may have been Super models since slightly after SML started producing saxophones until 1949.