Holy cow, that thing's beautiful!

Fantastic condition too -- I don't have sling loops for you, but they can be found new via one or two european distributors.
I don't have confirmation that Otto Geyger did or did not (with his own hands) make guns from raw material up to finished product, but I can say that every gun or rifle I've seen marked with his name was very very high quality equipment.
On the recoil pad, my guess is that you'll see a 'widow's peak' feature on the black spacer -- and that from the factory the rifle was shipped with a steel buttplate, possibly with a trap for a couple of cartridges.

Cheers
Tinker