The A-Grade was the same mechanically as the Nitro Special, it just had nicer frame profiling and a bit nicer wood. The Lefever A-Grade was only offered from 1934 to about 1938. Here is a Lefever A-Grade --
Most Lefever Nitro Specials were profiled like this --
and had a half-pistol grip stock --
After Ithaca dropped the Lefever A-Grade, Nitro Specials were profiled like this --
and had a capped pistol grip --
The Lefever A-Grade was offered in two models. The Model 5 was the basic double trigger, extractor gun, with a number of available options. The Model 6 was the "Skeet Gun" with all the options -- ejectors, single non-selective trigger, beavertail forearm and twin ivory sights. This 20-gauge is a skeet choked gun, with all the options except ejectors, so according to Walter it is an optioned up Model 5, not a Model 6 --