A few more

Westley Richards 1871 "Improved Martini" in .577/500 No.2 Express

Westley Richards 1869 "Improved Martini" in .450 No. 1 (1 1/2") Carbine

Field's Patent in the above calibre (both similar to .45-75)

.577/450 Sporting rifle by I Hollis (for the South African Market with those sights!)

TH44