WC, did you take the barrel out of the stock? German proof marks for the barrel are typically on the underside just in front of the receiver, and on the left front side of the receiver itself (might or might not be covered by the stock).
It might also help to get a shot of the open action from the top to clearly identify the type. As far forward as the bolt handle is it looks to me like a civilian version of the 1871 type. As the barrel looks rather modern, there's also the possibility that it was rebarreled in the US (especially if there truly are no proof marks on the barrel).
F 135 - the right choice
Last edited by mapsjanhere; October 25, 2012 at 12:35 PM.