1875, June: "Not for Ball" stamp promulgated.
1878, 23 Feb - W.C. Scott & Sons patent 761 - aka Triplex Action, coil spring back action hammerless lock; incorporates the Crystal Cocking Indicator.
Thus this fine Scott dates between 1878 and 1887 (though It could theoretically be post 1887; There are 1888 guns with "not for ball" proof marks.)
Are you positive that the locks incorporate coil springs? I’ve been into a few of these guns over the years and I’ve never seen one with coil springs in the locks. In my experience, The only coil springs on that entire gun are on the firing pins or “strikers”.
