Definitely Josette's music box, which I consider DS' most recognizable prop, but Barnabas' ring, cane (aka Willie-beater) and cape were biggies, the traveling afghan, Petofi's hand box, decks of tarot cards, candles, used in so many storylines. The list is endless.
I bought Josette's music box back in 1970 and was thrilled to have it (still do)! I purchased a Barnabas ring from Time Square Stores, and own it still.
Love, Robin