Looks like KM# 822.2, which is according to the catalog: 1872K Large K - F 15.00, VF 35.00, XF 65.00, UNC 150 1872K Small K - F 4.00, VF 8.00, XF 25.00, UNC 75.00 Yours might be $3 or $10 i guess, not sure what "K" is it.. if it is indeed a K, and not an A.