Garyg,
The first two sights in the third row from bottom from the left are Goss bolt sleeve sights and each is representative of different stage of development. Neither has a functional safety and the windage knob is on the right side of windage bar. The third sight in that same row is a Marble's Goss bolt sleeve sight. I have not seen a Goss or Marble's Goss bolt sleeve sight as Mr. Stroebel described in his book All that I have seen fit onto the bolt sleeve. That may have been an error in Mr. Stroeble's book.
Gary Bush
