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 6150-00-764-1943
NSN 5999-01-065-0233
NSN 5998-00-143-0485
NSN 7035-00-535-8109
NSN 6130-01-600-3384
NSN 5990-00-849-6358
NSN 6135-00-087-5300
NSN 6220-01-060-4984
NSN 6650-01-472-5028
NSN 7035-00-849-5526
NSN 5960-01-034-2937
NSN 2925-01-567-8027