Under the Steam Hammer - 1909 was released on:
USA: June 1909
Steam Hammer - 1904 was released on: USA: May 1904
Sledge Hammer - 1986 Under the Gun 1-1 was released on: USA: 23 September 1986
Hammer - 2006 was released on: USA: 2006 (internet)
The Hammer - 1915 was released on: USA: 9 July 1915
Steam - 1913 was released on: USA: April 1913
The Hammer - 2014 was released on: USA: 1 June 2014 (limited)
Steam - 2010 was released on: USA: 21 October 2010
Steam - 1995 was released on: USA: 1995 USA: 2005
The Hammer and the Butterfly - 2007 was released on: USA: 21 July 2007
Steam Tactics - 1901 was released on: USA: May 1901
Steam Whistle - 1904 was released on: USA: May 1904
Sledge Hammer - 1986 A Clockwork Hammer 2-1 was released on: USA: 17 September 1987