Felt inner lining. Embedded memory chip, w/backscatter protection.
No other part numbers with same form, fit, and function found.
NSN 5920-01-653-7981
NSN 5975-00-482-4663
NSN 6110-01-242-9765
NSN 6645-01-121-6952
NSN 5965-00-071-0562
NSN 6645-01-641-1575
NSN 5965-01-423-5159
NSN 6110-00-936-2110
NSN 5999-01-391-0386
NSN 5990-00-269-2226
NSN 5925-01-522-2386
NSN 6220-00-678-8479