Those Goss sights arelisted in pr4war Stoegers for 1903, Win 54 and 70, andKrag.  have one on an 03, one for a 54 in the sight box, and have been looking for a Kreg sight forever.  I had a 70 sight and sold it because the safety was rottn.  They are otherwisean excellentsight and can be marked Goss or Marble Goss ' at least the 03 sights canbecause I hafveseen themboth  way. 
Many years ago I cut my nose on an  03 Goss sight, the Ace trigger shoe fell off during a string of rapid fire in a match, I was all scrunched up shooting prone stuffing in clips and the change in the trigger totally discombobulated me