[78-L] Columbia flag label

[marimbamoods at comcast.net]

is that session by Art Gillham on Columbia flag label 328-D from 25 February 1925 the first electrically recorded 78 record sold? 


is the letter "W" in the dead wax of these Columbia flag label discs stand for Western Electric? 


i have a few Columbia flag label discs, including one that is a re-issue of an earlier Columbia acoustic A 3317, matrices 78861 & 78862. i also own the original acoustic issue of A 3317. however, it is odd to see the acoustic number A 3317 on the flag label. 


best, david harvey