Has anyone knowledge or experience of this type of tool, please?

It is stamped "Wickman C WD 33169" (no broad arrow) and came with the tipped form tool/blade seen installed in the photo plus four others of various forms.
So far as I can gather from the markings on the form tools they are intended for particular TPI/thread form combinations but the markings are not easy to read. The one in the picture seems to say "10 TPI UNC" and I have successfully cut a thread with it.
Some of the other blades have what look like code numbers and it would be helpful to be able to relate these to the thread form.
Unlike some similar tools there is no provision for adjusting the helix angle.