I'm fairly confident that the following image of the marks of a H. Scherping retailed Sauer is that of M4 and it has the typical pre-1910 DR marks, including an additional set of "Eagle" "Crown/G" closer to the forend lug on the tubes.

No chicken scratching lower on the flats with a "Crown/N" or bullet type. It does however have both large and small crowns where the Sauer Modell 32 only has the large crown?

Kind Regards,

Raimey
rse