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 5930-01-123-9344
NSN 5960-01-268-8674
NSN 6135-00-080-9176
NSN 5835-01-424-4577
NSN 6610-00-108-9546
NSN 6610-00-982-6768
NSN 2925-01-170-1089
NSN 6220-00-660-5539
NSN 6650-00-170-5095
NSN 6650-00-973-9533
NSN 5999-00-445-1121
NSN 5965-01-388-1379