The above two pictures show both sides of four of my better ivory chips:
¶ the large dealer chip is about 4" x 3-1/2." Dale Seymour shows it on page 363 of his "Antique Gambling Chips" -- from a Xerox I took of my very own chip. He chose this chip to fill up his title page to the section on "Dealer Chips." It is made of ivory and sterling silver -- if you look close at the second picture, you can see the word "sterling." I imagine that the sterling was added to let one more easily push the buck to the next dealer. It is very sold with only hairline cracks.
¶ the smaller ivory buck is about 2-1/4" x 1-3/4." The reverse side is nice and smooth -- too bad it must have rested on some paint or cleaner agent once.
¶ the "100" ivory is 2" in diameter! It is on page 99 of Lenny Schneir's "Gambling Collectibles -- a Sure Winner." I allowed Lenny to have it photographed for his book. He describes it as "c. 1860's: Largest Ivory Chip Known -- two inch diameter! This hand scrimshawed $100 ivory chip is among the most valuable of all ivory chips" At least in 1993, when he wrote the book.
¶ the "25" ivory is one of my better ivories -- 1-3/4." diameter.

Robert