A framed unit, with attachments to exclude water and control the entrance of air and light, designed to fit a ship's porthole.
NSN 5996-00-193-0585
NSN 5990-01-458-6789
NSN 7035-00-148-2300
NSN 6610-00-951-4451
NSN 5835-01-041-6879
NSN 5975-00-078-9117
NSN 5920-01-630-9082
NSN 2925-00-887-2073
NSN 5925-01-377-5890
NSN 6130-00-277-7321
NSN 5990-01-586-7318
NSN 6620-01-205-6608