It is known (verified) that Lt. Fred. H. Beecher (KIA Beecher Island, Sept 1867) owned a Savage Navy Ring Cocker during the CW. The whereabouts of his holster and belt are known, and verified by a letter written by his two nephews in the 1940's. Unfortunately, they sold the gun, itself, back then.
The holster is a full-flap military style, but would swallow a M1860 Colts or Remington with room to spare. But another Savage fits like a glove, even to the indentation where the hammer contacts the flap! Beecher, by the letters he wrote to his brother prior to Fred's death, indicate he owned a Hawken, and several other guns, in addition to being issued a M1860 Colt's Army. He also asked his brother to send him a Henry repeating rifle! As one of those was known to have been at the Beecher Island battle, it may well have been his, given to Scout Pierre Trudeau before the latter went for help! I saw a Slocum revolver and a writing desk at a gun show many years ago, but couldn't afford them at the time.
BTW, today is the anniversary of both the Battle of Breed's (Bunker) Hill and the Rosebud Battle.