R-1521-b to be stamped or stenciled on lens per dwg b-11950-1
NSN 5998-01-185-6591
NSN 5985-00-288-6001
NSN 2925-00-660-8131
NSN 5915-01-579-7770
NSN 6150-00-262-0477
NSN 6135-00-738-5571
NSN 6645-00-226-0657
NSN 6110-01-483-2607
NSN 5835-01-561-2959
NSN 6650-01-469-2400
NSN 6240-00-261-8430
NSN 6130-01-257-7305
Last Updated: 04/24/2024