This tools in this Checkered Background Stamp set are numbers A104, A104-2, A105 & A118. The tools measure from 1/8" to 5/16" in length. Stamped on each tool is its number and "Craft Japan". This is a great stamp set that produces nice impressions.
The growth and popularity of leather carving in the USA in the 1950's and 60's spread to other countries. While Craftool stamps were the standard, they were not commonly available to craftsmen in foreign countries. In Japan, a couple of companies started producing tools similar to Craftool but also became great innovators. Those companies, Craft and Co. and Kyoshin Elle, produce fine quality tools in unique designs along with the basics.