Nice guess LH
My favorite army maker is emil voos but this pack makes me think.
1.Early pack slant grip-maker mark close to reverse crossguard refer to the picture that i found on the forum of Janos's Early pack.
2. Early Pack that i have shown here with early fittings and mid period grip, with small Seigfried stamped frather down the blade,also consult Wittmans army book the early pack that he shows is actually one like mine, mid period grip and small sigfried stamped frather down the blade, his has aluminum fittings.
3. Seigfried Pack & Sohn without the large "s"
4. Seigfried Pack & Sohn with the large "s"
So i think you can make a case that Pack & Sohn actually had 4 different trademarks.
I find this quite intriguing, Some of you may say so what but to an army dagger collector this is what we live for.