I don't know "big" he may have been (comparatively speaking), but he certainly carved a niche for himself in the world of what I'll call weird guns. Weird translates to not in the catalog.
Chiefs Special Targets come to mind, as does the "Post-war/pre-war" .32 Regulation Police Targets as does pretty much any other model with odd-ball configuration------barrel lengths/presentation grips---which was pretty much everything on display in his retail store---aside from engraved guns which he pretty much always had on hand----no special order---no waiting.
AND he was a hustler! I knew of him (via St. Louis area retailers of his odd-ball stuff), but had never met him. Then one day the phone rang. The voice said, "This is Herbie Harris in Chicago. You call yourself a collector of Smith & Wesson target guns---I've got one you've got to have!" So---my new bride and I subsequently drove 600 miles out of our way on our honeymoon to pick up my shiny new .32 Regulation Police Target. Thus was her up close and personal introduction to the world of lunatic fringe gun collectors----in June, 1959. He continued to call for the next 10-12 years---still hustling.
Sitting here now, and not being quite sure when target hammers made their appearance, I'm inclined to suspect yours was one of the early ones; and I'm surprised he didn't order more than 25. If he was still here, you can bet he'd tell us target hammers were his idea. He was all mouth, and a lot of fun; and it didn't make any difference if you were just buying one gun or a truck load.
Ralph Tremaine