I, too, have this catalogue. The basic F/f-alto was a Mod 50 and the variant with stopping valve was a Mod 51. In both cases, an optional kit of slides could be had to convert the long F side to Bb (which would make the Mod 51 a Mod 40, I suppose). Further variants of the Mods 50 and 51 were Mods 53 and 54 respectively with ascending third valves on the long F sides only.
Although the catalogue does mention that the first Merewether-designed F/f-alto was in L bore, people placing orders for any models in the catalogue could specify which bore (A = the narrowest, M, L or XL) they wanted for their horn.
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