What Tom said. A 1910 Hunter Arms catalog is on the LCSCA site, and does not list ivory beads as an option http://www.lcsmith.org/images/CoverCatalog1910.pdf
I'm not sure when they were first available.
Starting in about 1920, sportsmen could order any grade of L.C. Smith with a “trap package” which included a beavertail forend (the Schnabel beavertail forend was introduced in 1922), reinforced barrel lug, automatic ejectors, selective Hunter One-Trigger, recoil pad (usually a Hawkins or Jostam), and two ivory beads (usually Lyman).