When this putter was first produced, it was referred to as the "Chantilly Putter," after Chantilly, France, the home of its inventor, the Marquis de Chasseloup-Loubat.  Jean Gassiat was the French golf professional who worked at Golf de Chantilly, in Chantilly, France. He was a champion golfer in his own right, defeating Harry Vardon in 1912 to win the French Open. Gassiat used the Chantilly putter as did others.

This example is marked "Jean Gassiat"  and was covered under a British registered design number issued in 1913. Most of the known Gassiat-style putters are not marked Gassiat. This one is.

The club has its original shaft which is marked with Wm Gibson's small star, as Gibson was the maker of this club.  The original pistol grip on this club is described in an October 31, 1913 Golf Illustrated review as an "extra thickness at the top for the use of the left hand."

The finish on this putter is original, and the club still looks great!  A solid Gassiat marked "Gassiat."

TCA1 v2 p537