Every black one I ever handled was a magnum, this one clearly is not.
Seen a few blue units, but, they didn't get that way at the factory.
Might want to mention that one shouldn't throw a bunch of money at an R10 that looks like this, either as a purchase, or for gunsmithing. Recovery of said pile of money might be difficult. Darnes are easier to buy, than to sell. Particularly examples clearly not in original condition.
JC, those proof charts predate the 1923 revisions in France-note that triple proof actually has FOUR stamps. Triple proof has been marked with three stamps (crossed palms) since that year. Relevant to guns that were built prior to 1923, but, not this shiney example we see today.
Best,
Ted