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I expect that this was done in the interest of cost savings the original lock was stronger and more fool-proof. Both of these features were eventually discontinued the trigger-safety was removed and the lock was replaced with a simple T-Bar lock similar to S&W revolvers of the period. The locking mechanism is very strong, using a single side-lever to turn a solid bar to disengage. It uses their famous transfer-bar safety, and additionally has a trigger-safety that would later see use on the uber-popular Glock semi-automatic pistols. The gun we are discussing is an Automatic Safety Hammerless Model 1.
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They advertised prolifically, with a strong emphasis on the safety of these guns. In succeeding years they made inexpensive solid-frame revolvers and single-barrel top-break shotguns as well. They were nothing if not prolific they made 100,000 revolvers in their first year of production, which sold, depending on the model, for $4-$8. The Automatic portion of the name referred to the fact that it automatically ejected the cartridges when the revolver was opened. The ‘Safety’ referred to the use of a transfer-bar safety, which allowed the gun to be carried with the hammer down on a loaded chamber. In 1894 launched the production of their ‘Safety Automatic’ revolvers, and shortly thereafter launched hammerless versions of these guns. Iver Johnson’s Arms and Cycle works was formed under that name in 1891 in Fitchburg, Massachusetts.