Model 27
Top action and a .563 bore, short bell 11.25 inch diameter, 3rd valve loop indicates low pitch
Model 463
Top action and a .563 bore, tall bell 11.5 inch diameter, long leadpipe
Model 81 "Professional"
Top action and a .563 bore, tall bell 11.5 inch diameter, long leadpipe
Model N460
Top action and a .563 bore, tall bell 11 inch diameter, modern design