The lower end of the rod groove will tell the story. If the groove disappears under the band, the stock once had a filler and it has been removed. The rod groove of a virgin stock will terminate in a very visible ellipse, well clear of the front edge of the band.

Of course, we are only discussing the narrow filler version here, where the groove was not widened, only squared-out. Such stocks are fine for lower-grade re-assemblies for a "representative" 1892, not subject to intensive scrutiny.

A wide-filler stock is only good for a 92/96. Have not yet been into the vault, but I still think my wide (only) filler lacks pins. Stay tuned.