Thanks, Juv and 3sp. I was not familiar with the manufacturer Duprat. I am very happy to have had this component identified (and complimented).
It is indeed a 9mm (checked it with the ruler in my Peterson's Field Guide)
3s, I don't have pedals, yet.
Although there are several (severel?) differences between my crank and the one in the Velo Base link above, I imagine it is just a different vintage.