The action in the photos looks very much like the previopusly mentioned Kettner rifle described by deHass in his single shot book. Another photo of an action like that shown is in J. J. Grant's Boy's Single Shot Rifles where he identifies it as a Schmidt & Habermann. In a later book deHass identifies the action of a rifle made by Kommer and similair in appearance to the one in the Photos as Schmidt & Habermann. As Vall mentions, the, the action has some of the characteristics of The Haenel K-Sport.
It appears unlikely that the action is a Hauck as this action is somewhat bulky, appears to be deeper through the action and did not have a top tang. Have only seen one a number of years ago but it had no safety and one had to push the finger lever foreward prior to it swinging down. Avilable photos of this action show no tang and no safety - although some specifications for this action do list a safety as available as an option.
The action does look very Germanic. Depending on what era Shelhamer did most of work one might be able to eliminate one or more of these actions.
My best guess is that this was an action manufactured in Germany or possibly Austria and made available to the trade after WW1
Bill
