A most unusual French semi automatic scarificator, signed 'R.A.M. No8 Mod Depose'. The outer casing is enclosed in a second metal sheath. When pressure is applied to the base the scarificator "fires" its 8 blades (too quick for the human eye to see). The spring loaded mechanism automatically returns to the original position primed and ready for the next release. The small circular dial when turned brings the blades into view. Fine condition with virtually no rust and fully functional (it tends to stick with repeated use but is easily reset). This remarkable piece dates to the early 20th century. I have not seen another like it.