Not mine, but a buddy's score today (he was faster than me) from our trip down-valley:
Crucible steel!
L. Gueutal, France. I think the M. G. (or C) is an owner's mark.
Nice box joints, still nice and tight after well over 100 years.
A little Googling found a tiny bit about L. Gueutal. Early-to-mid 19th century maker of watchmaker's and jewelers tools. That's about it.