Sorry, I've been a bit slow getting around to replying, we've had a busy time of it the last week or so.
That strange previous post (which I've now deleted) is a spammer, promoting something or other... I need to get a better blocking setup on the forum.
Anyway, back to the Colver Brothers, the "Pilot Works" Sheffield from 1879 ( HSMOB ) to 1925 or so..
187 1893 Kellys 1893 COLVER Robert Saw &c. manufacturer (Colver Brothers Limited) & (Jonas & C
188 1893 Kellys 1893 COLVER (Brothers Limited) Steel, saw, file & machine knife manufact Pilot works, Cotton Mill Row
189 1919 Whites 1919 COLVER (Brothers Ltd.) manufacturers of steel, files, saws, machine 79 Corporation Street & Union Wheel, Alma Street
190 1925 Kellys 1925 COLVER (Bros. Ltd.) saw manufacturers Neepsend & Corporation Street
I'm not sure what happened after 1925, but that's a very pretty little saw. Nice find.