The smallest tap and die is 1/16" '24' and the largest pair is stamped '20' 1/4 1/64 (17/64"). The others run from 3/32" to 1/4" in 1/64" increments. The set appears to be complete and 100% original. The box is also in superb condition. Very clean and with a 95% intact top label. The finest set of tap and dies I have owned. Likely pre 1900.
Label on the front reads as follows:
SET NO. 70A
IMPROVED SCREW PLATES
MANUFACTURED BY BUTTERFIELD & CO
DERBY LINE VT USA
ROCK ISLAND PQ CAN