Hamon's "Retroceps" by
Mathieu circa 1860. The left blade can be
rotated and is anchored in position within the German silver
handle by a fixed pin which fits into one of 4 holes
in the steel disk at the proximal end of the blade.
The right blade does not rotate but and be abducted or
adducted by loosening or tightening the screw on the
right of the handle. Fine quality and a very rare
instrument. See Kedarnath Das Obstetric Forceps page
411 which illustrates this very model by Matthieu
