Sure is tough to tell with such a fuzzy photo. May be a Berthier but something just doesn't look right. Maybe its the angle fo the photo.
Point in interest about 8mm Lebel: Grafs has new brass and Lee makes dies so its available as a roll your own cartridge.
Agreed, it looks like a bubba'd milsurp and as such is in the $50 to $100 range depending on condition, caliber and how bad a guy needs the parts.