Battle Honours and Mutton Chop were listed under their respective new ownership.
If we include things beyond the original 18401920 focus of this thread, here's an updated list:
Bac Ninh Boshin War
Bohemian Troops Thirty Years' War
Bohemian Troops 1930s Czechoslovakia
Brigade Games Gladiators
Brigade Games Swashbucklers
Brigade Games King Philip's War
Brigade Games Pirates
Brigade Games (incl. former Victrix) Napoleonics & War of 1812
Brigade Games Victorian (some, not all)
Brigade Games Steampunk
Brigade Games Old West
Brigade Games First World War (some, not all)
Brigade Games 1920s "Mob Wars"
Brigade Games Lost World Explorers
Brigade Games Pacific War
Brigade Games China at War
Brigade Games WW2 Unique Miniatures (most, not all)
Brigade Games Atomic Cafe
Claymore Castings Anglo-Scottish Wars (late 14th century)
Dadi e Piombo Moderns (some, not all)
Ebor War of Spanish Succession
Empress New Zealand Wars
Empress Anglo-Zulu Wars
Empress 3rd Anglo-Afghan War
Empress Abessinian War
Empress Spanish Civil War
Empress/Mutton Chop Very British Civil War
Hinterland Female Hussars (pre-)First World War
Mongrel Moderns (most, not all)
Murawski Napoleonic Polish
Musketeer First World War (some, not all)
Newline Designs/Pontoonier 3rd Anglo-Burmese War
Old Glory/Battle Honors First World War (some, not all), Very British Civil War
Pro Gloria 16th Century Europe
Redstar French Indochina War
Tsuba Russo-Japanese War
Tsuba German Revolution
Warlord/Arsenal 16th Century Ottoman Wars
Warlord/Bolt Action Second World War (some, not all)
Warlord/Radetzky Crimean War
Westphalia Napoleonics
Phew