Ivory scrimshaw pendant with sailing ship

Nice ivory necklace/pendant measures 1/2" x 3/4" sterling silver frame. Scrimshaw of an old sailing ship carved into natural ivory. It comes with a nice chain but I'm not sure if it is sterling or the original chain. Chain is 19" and has a lobster claw clasp. I'm including the chain as a bonus when you buy the pendant. Very detailed.