No other part numbers with same form, fit, and function found.
A sighting device consisting of (1) a string and a web belt which is attached to the outside of the muzzle end of the tube, or (2) a disk, with a central peephole, which is inserted in the bore, or (3) a short piece of tubing, with cross lines, which is inserted in the bore of a cannon.
NSN 5930-01-051-0593
NSN 5855-01-020-7982
NSN 5895-00-223-3869
NSN 5835-01-629-2044
NSN 5965-01-133-7459
NSN 5935-00-683-7894
NSN 6620-01-200-6493
NSN 2925-00-233-5644
NSN 5950-00-926-3304
NSN 6150-00-181-1711
NSN 6320-01-206-1055
NSN 5960-00-228-5985