Sorry, don't know anything about the dagger,,but I gotta agree with Fred,,those are the worst looking silver marks anyone I'll bet has seen..

Gahr marks are pretty well known. ,,none look like these..

They should be stamped in,,not cast in as these obviously are..
Gahr made some really beautiful pieces. IF he made these links he'd want people to know it,,the stamp would be nice and clear,,it would be a matter of pride.
Silver guys familiar with the early German law would also point out that is not the proper crown. I've seen some variant with the moon,and some slight variants with the crown but that is no where close..
Fred,your spot on,,no little 8s and 0s..............