Black Butler I
The following weapons were used in the anime series Black Butler I:
Ciel Phantomhive carries Baby Browning pocket pistol at two points during the series: first seen in "His Butler, Chance Encounter" (S1E05) and later more notably when Ciel holds Correro hostage with one in "His Butler, Escaping" (S1E20).
FN Model 1900
Mey-Rin uses dual FN Model 1900s in "His Butler,Engaging Servants" (S1E21).
Webley-Fosbery Automatic Revolver
The gangster Azzurro carries a very ornate looking Webley-Fosbery Automatic Revolver in "His Butler, Strongest" (S1E02). This is also the revolver that can be briefly spotted in the first opening credits sequence.
Many of Azzurro's henchmen in "His Butler, Strongest" (S1E02) use what largely appear to be Webley Bulldog revolvers, all drawn in wildly varying degrees of detail. In "His Butler, Engaging Servants" (S1E21), some of Corraro's henchmen are also seen with Bulldog-styled revolvers.
Smith & Wesson Schofield
Several of Azzurro's henchmen in "His Butler, Strongest" (S1E02) can be seen firing Smith & Wesson Schofield revolvers.
Colt 1871-72 Open Top
The Scotland Yard commissioner Arthur Randall carries a Colt 1871-72 Open Top revolver as his weapon of choice as seen in "His Butler, Imprisoned" (S1E19).
Corraro cleans and handles a gold plated Colt Peacemaker with 7.5" barrel in "His Butler, Engaging Servants" (S1E21).
Lee-Enfield No. 1
One of Azzurro's henchmen uses a scoped Lee-Enfield No. 1 Mark III rifle while trying to assassinate Sebastian in "His Butler, Strongest" (S1E02). Although poorly drawn, perhaps largely due to them being drawn from a distance, Azzurro's other henchmen are also scene with scoped Lee-Enfields while defending the grounds of his mansion in the same episode. The Queen's royal guard can also be seen with the rifles near the end of the series in "His Butler, Up in Flames" (S1E23). The appearance of what appear to be Mark III rifles is a notable anachronism, as the show takes place near the turn of the 19th Century, and Lee-Enfield No. 1 Mark III rifles wouldn't be introduced until 1907, although it's possible these rifles in the series are meant to represent the older "Magazine Lee-Enfields" that were in service beginning in 1895 (Which would then be closer in appearance to Baldroy's Lee-Metford rifle as seen below).
Lee-Metford Mk I
Baldroy and Mey-Rin both wield Lee-Metford Mk I rifles while protecting the Phantomhive mansion in "His Butler, Engaging Servants" (S1E21). Baldroy and other British troops are also seen carrying them in a flashback during the same episode.
Mauser Model 1889
At the beginning of "His Butler, Engaging Servants" (S1E21), Mey-Rin can be seen sighting in an assassination target with what appears to be a 1889 Belgian Mauser. She ditches the scope, preferring to use the iron sights.
Double barreled shotgun
Baldroy uses a hammerless double barreled shotgun against a demon hound in "His Butler, Up in Flames" (S1E23), first using some kind of 19th Century tranquilizer, and later uses lethal ammunition when that doesn't work.