i try and use the good eye - rather than the glass one...

ball & bead breeches might be easiest explained by a few photos from a 1902 w & c scott/webley screwgrip gun i bought a few weeks back;

https://www.gunbroker.com/Item/1085152120

photos # 21 thru 24 show the typical rounded balls and the beaded edges that define them - it this case very handsomely done to my eye(s).

best,

tom

"it's a poor sort of memory that only works backwards."
lewis carroll, Alice in Wonderland