Javier Martínez Ruiz is an expert on the Basque bordermarkers, his knowledge brought together in his encyclopedic article “Los mojones internacionales desde Biriatou hasta Arneguy” (see my literature-list). Recently he re-visited bm141 to 148, primarily to visit bm145 because of the amazing discovery of Jacques Koleck (see previous post).
But he also remembered that there’s a number 146, engraved in a rock close to bm146.

And he sent me two pictures from which I made this compilation. This rock is ± 15 meters west of bm416 and it seems if only the number is engraved, no cross.