The key is the EXPOSED elliptical termination of the channel, WELL clear of the band. If the channel disappears under the band, you need to worry about the stock having been "restored", since the narrow-style 1896 filler can be removed by an unscrupulous person. It will still have a square bottom, of course, but this can easily get overlooked when in buying lust, especially in poor light. By contrast, the wide-style filler, once applied, cannot be mistaken.