Number 40, a-5 clipper blade made by oster
NSN 6685-00-646-7044
NSN 5996-01-542-8611
NSN 6645-01-070-6342
NSN 5905-01-519-9021
NSN 5965-01-543-2762
NSN 6220-01-537-0129
NSN 7035-00-585-2113
NSN 5960-00-372-4876
NSN 5855-00-135-9064
NSN 7035-01-227-2546
NSN 5895-00-100-4877
NSN 5975-01-464-1826