Another chalenge

[fernando]

Thank you so much for the links, Glen,
I knew these 'classic' augers; there are a couple wooden shipyards around.
What i didn't know was the term auger which, in return, i tell you how we call them in portuguese: trados. I dare say that those augers are not only used in boat building but also on a multipurpose basis, civil carpentry, cooperage, etc. ... still in use nowadays, although produced by specialized machinery.
What i find atypical in my example is that, instead of having that spiral screw continuity, only has one single hélix blade, so wide as 70 milimeters, as if the material it has to drill is rather soft and so easy to penetrate.
I would venture this is definitely a tool for a very specific job.
Surely a primitive tool, i would say from the 19th century.