Water-table is the top of the frame where the tubeset mates with the frame. Also, the rib extension I'm curious about is the top rib where it & the Greener crossbolt mates with the frame.
I see now it is F.W. Vandrey & Co. of Hamburg. That explains the jagged encircled GS(or is it GG??). Did you acquire this from Cabelas of Richland, Wisconsin? I called there to get an opinion on the calibre & really could not get the fella to explain or describe to me the liner or if there was a liner.
Kind Regards,
Raimey
rse