This is a later example I have of a mid-grade model 12 SLE circa 1890.I think the use of the crystal indicator was discontinued around 1892.This is a back-action lock in a bar-shaped lockplate.
Also has Scotts Lever-Grip top bite and patent gas vents on the breech face.Interesting how the various Scott actions evolved over a period of some 25 years.





Better to keep your mouth shut and be thought stupid,than open it and confirm.