0.50 diopter cross cylinder for the phoropter minus cylindrical lens type end item nsn 6540-00-877-6464. Found in army unit assemblage n315, medical materiel set eye exam clinic: depmeds
NSN 5975-01-604-0297
NSN 6650-00-418-2129
NSN 7035-01-169-6551
NSN 6320-01-519-0916
NSN 5895-00-694-9285
NSN 6105-00-003-6141
NSN 5925-01-055-3868
NSN 5960-01-548-4896
NSN 2925-01-371-6853
NSN 5975-01-558-4135
NSN 6145-01-468-5467
NSN 6645-01-075-5306